diff --git a/packages/client/src/methods/bots/get-bot-menu-button.ts b/packages/client/src/methods/bots/get-bot-menu-button.ts
index 06ef04c7..11f1d615 100644
--- a/packages/client/src/methods/bots/get-bot-menu-button.ts
+++ b/packages/client/src/methods/bots/get-bot-menu-button.ts
@@ -13,13 +13,8 @@ export async function getBotMenuButton(
     this: TelegramClient,
     user: InputPeerLike
 ): Promise<tl.TypeBotMenuButton> {
-    const userId = normalizeToInputUser(await this.resolvePeer(user))
-    if (!userId) {
-        throw new MtInvalidPeerTypeError(user, 'user')
-    }
-
     return await this.call({
         _: 'bots.getBotMenuButton',
-        userId,
+        userId: normalizeToInputUser(await this.resolvePeer(user), user),
     })
 }
diff --git a/packages/client/src/methods/bots/get-game-high-scores.ts b/packages/client/src/methods/bots/get-game-high-scores.ts
index 31ecd04c..b1d125de 100644
--- a/packages/client/src/methods/bots/get-game-high-scores.ts
+++ b/packages/client/src/methods/bots/get-game-high-scores.ts
@@ -27,10 +27,7 @@ export async function getGameHighScores(
 
     let user: tl.TypeInputUser
     if (userId) {
-        const res = normalizeToInputUser(await this.resolvePeer(userId))
-        if (!res) throw new MtInvalidPeerTypeError(userId, 'user')
-
-        user = res
+        user = normalizeToInputUser(await this.resolvePeer(userId), userId)
     } else {
         user = { _: 'inputUserEmpty' }
     }
@@ -63,10 +60,7 @@ export async function getInlineGameHighScores(
 
     let user: tl.TypeInputUser
     if (userId) {
-        const res = normalizeToInputUser(await this.resolvePeer(userId))
-        if (!res) throw new MtInvalidPeerTypeError(userId, 'user')
-
-        user = res
+        user = normalizeToInputUser(await this.resolvePeer(userId), userId)
     } else {
         user = { _: 'inputUserEmpty' }
     }
diff --git a/packages/client/src/methods/bots/normalize-command-scope.ts b/packages/client/src/methods/bots/normalize-command-scope.ts
index 0575304d..bb3b7cb8 100644
--- a/packages/client/src/methods/bots/normalize-command-scope.ts
+++ b/packages/client/src/methods/bots/normalize-command-scope.ts
@@ -26,12 +26,11 @@ export async function _normalizeCommandScope(
             }
         }
         case 'member': {
-            const chat = await this.resolvePeer(scope.chat)
             const user = normalizeToInputUser(
-                await this.resolvePeer(scope.user)
+                await this.resolvePeer(scope.user),
+                scope.user
             )
-
-            if (!user) throw new MtInvalidPeerTypeError(scope.user, 'user')
+            const chat = await this.resolvePeer(scope.chat)
 
             return {
                 _: 'botCommandScopePeerUser',
diff --git a/packages/client/src/methods/bots/set-bot-menu-button.ts b/packages/client/src/methods/bots/set-bot-menu-button.ts
index f49740d2..113a8c7a 100644
--- a/packages/client/src/methods/bots/set-bot-menu-button.ts
+++ b/packages/client/src/methods/bots/set-bot-menu-button.ts
@@ -14,14 +14,9 @@ export async function setBotMenuButton(
     user: InputPeerLike,
     button: tl.TypeBotMenuButton
 ): Promise<void> {
-    const userId = normalizeToInputUser(await this.resolvePeer(user))
-    if (!userId) {
-        throw new MtInvalidPeerTypeError(user, 'user')
-    }
-
     await this.call({
         _: 'bots.setBotMenuButton',
-        userId,
+        userId: normalizeToInputUser(await this.resolvePeer(user), user),
         button,
     })
 }
diff --git a/packages/client/src/methods/bots/set-game-score.ts b/packages/client/src/methods/bots/set-game-score.ts
index 268b9e2a..d61559c2 100644
--- a/packages/client/src/methods/bots/set-game-score.ts
+++ b/packages/client/src/methods/bots/set-game-score.ts
@@ -37,9 +37,8 @@ export async function setGameScore(
 ): Promise<Message> {
     if (!params) params = {}
 
+    const user = normalizeToInputUser(await this.resolvePeer(userId), userId)
     const chat = await this.resolvePeer(chatId)
-    const user = normalizeToInputUser(await this.resolvePeer(userId))
-    if (!user) throw new MtInvalidPeerTypeError(userId, 'user')
 
     const res = await this.call({
         _: 'messages.setGameScore',
@@ -85,8 +84,7 @@ export async function setInlineGameScore(
 ): Promise<void> {
     if (!params) params = {}
 
-    const user = normalizeToInputUser(await this.resolvePeer(userId))
-    if (!user) throw new MtInvalidPeerTypeError(userId, 'user')
+    const user = normalizeToInputUser(await this.resolvePeer(userId), userId)
 
     const [id, connection] = await this._normalizeInline(messageId)
 
diff --git a/packages/client/src/methods/chats/add-chat-members.ts b/packages/client/src/methods/chats/add-chat-members.ts
index 5be289fe..a3f7e02c 100644
--- a/packages/client/src/methods/chats/add-chat-members.ts
+++ b/packages/client/src/methods/chats/add-chat-members.ts
@@ -32,7 +32,6 @@ export async function addChatMembers(
     if (isInputPeerChat(chat)) {
         for (const user of users) {
             const p = normalizeToInputUser(await this.resolvePeer(user))
-            if (!p) continue
 
             const updates = await this.call({
                 _: 'messages.addChatUser',
diff --git a/packages/client/src/methods/chats/ban-chat-member.ts b/packages/client/src/methods/chats/ban-chat-member.ts
index c702fda5..f8e6d051 100644
--- a/packages/client/src/methods/chats/ban-chat-member.ts
+++ b/packages/client/src/methods/chats/ban-chat-member.ts
@@ -44,13 +44,10 @@ export async function banChatMember(
             },
         })
     } else if (isInputPeerChat(chat)) {
-        const normUser = normalizeToInputUser(user)
-        if (!normUser) throw new MtInvalidPeerTypeError(userId, 'user')
-
         res = await this.call({
             _: 'messages.deleteChatUser',
             chatId: chat.chatId,
-            userId: normUser,
+            userId: normalizeToInputUser(user),
         })
     } else throw new MtInvalidPeerTypeError(chatId, 'chat or channel')
 
diff --git a/packages/client/src/methods/chats/delete-channel.ts b/packages/client/src/methods/chats/delete-channel.ts
index 5ceef901..53c742fd 100644
--- a/packages/client/src/methods/chats/delete-channel.ts
+++ b/packages/client/src/methods/chats/delete-channel.ts
@@ -13,12 +13,9 @@ export async function deleteChannel(
     this: TelegramClient,
     chatId: InputPeerLike
 ): Promise<void> {
-    const peer = normalizeToInputChannel(await this.resolvePeer(chatId))
-    if (!peer) throw new MtInvalidPeerTypeError(chatId, 'channel')
-
     const res = await this.call({
         _: 'channels.deleteChannel',
-        channel: peer,
+        channel: normalizeToInputChannel(await this.resolvePeer(chatId), chatId),
     })
     this._handleUpdate(res)
 }
diff --git a/packages/client/src/methods/chats/delete-history.ts b/packages/client/src/methods/chats/delete-history.ts
index b78545d2..f16c14e0 100644
--- a/packages/client/src/methods/chats/delete-history.ts
+++ b/packages/client/src/methods/chats/delete-history.ts
@@ -2,7 +2,7 @@ import { tl } from '@mtcute/tl'
 
 import { TelegramClient } from '../../client'
 import { InputPeerLike } from '../../types'
-import { normalizeToInputChannel } from '../../utils/peer-utils'
+import { isInputPeerChannel, normalizeToInputChannel } from "../../utils/peer-utils";
 import { createDummyUpdate } from '../../utils/updates-utils'
 
 /**
@@ -36,13 +36,12 @@ export async function deleteHistory(
         maxId,
     })
 
-    const channel = normalizeToInputChannel(peer)
-    if (channel) {
+    if (isInputPeerChannel(peer)) {
         this._handleUpdate(
             createDummyUpdate(
                 res.pts,
                 res.ptsCount,
-                (channel as tl.RawInputChannel).channelId
+                peer.channelId
             )
         )
     } else {
diff --git a/packages/client/src/methods/chats/delete-user-history.ts b/packages/client/src/methods/chats/delete-user-history.ts
index 5bf4af5d..ce34dd09 100644
--- a/packages/client/src/methods/chats/delete-user-history.ts
+++ b/packages/client/src/methods/chats/delete-user-history.ts
@@ -2,10 +2,7 @@ import { tl } from '@mtcute/tl'
 
 import { TelegramClient } from '../../client'
 import { InputPeerLike, MtInvalidPeerTypeError } from '../../types'
-import {
-    normalizeToInputChannel,
-    normalizeToInputPeer,
-} from '../../utils/peer-utils'
+import { normalizeToInputChannel } from '../../utils/peer-utils'
 import { createDummyUpdate } from '../../utils/updates-utils'
 
 /**
@@ -20,10 +17,9 @@ export async function deleteUserHistory(
     chatId: InputPeerLike,
     participantId: InputPeerLike
 ): Promise<void> {
-    const channel = normalizeToInputChannel(await this.resolvePeer(chatId))
-    if (!channel) throw new MtInvalidPeerTypeError(chatId, 'channel')
+    const channel = normalizeToInputChannel(await this.resolvePeer(chatId), chatId)
 
-    const peer = normalizeToInputPeer(await this.resolvePeer(participantId))
+    const peer = await this.resolvePeer(participantId)
 
     const res = await this.call({
         _: 'channels.deleteParticipantHistory',
diff --git a/packages/client/src/methods/chats/edit-admin-rights.ts b/packages/client/src/methods/chats/edit-admin-rights.ts
index 505e294e..92d09fdf 100644
--- a/packages/client/src/methods/chats/edit-admin-rights.ts
+++ b/packages/client/src/methods/chats/edit-admin-rights.ts
@@ -23,11 +23,8 @@ export async function editAdminRights(
     rights: Omit<tl.RawChatAdminRights, '_'>,
     rank = ''
 ): Promise<void> {
-    const chat = normalizeToInputChannel(await this.resolvePeer(chatId))
-    if (!chat) throw new MtInvalidPeerTypeError(chatId, 'channel')
-
-    const user = normalizeToInputUser(await this.resolvePeer(userId))
-    if (!user) throw new MtInvalidPeerTypeError(userId, 'user')
+    const chat = normalizeToInputChannel(await this.resolvePeer(chatId), chatId)
+    const user = normalizeToInputUser(await this.resolvePeer(userId), userId)
 
     const res = await this.call({
         _: 'channels.editAdmin',
diff --git a/packages/client/src/methods/chats/get-chat-event-log.ts b/packages/client/src/methods/chats/get-chat-event-log.ts
index 08722bb2..453b33ce 100644
--- a/packages/client/src/methods/chats/get-chat-event-log.ts
+++ b/packages/client/src/methods/chats/get-chat-event-log.ts
@@ -86,8 +86,7 @@ export async function* getChatEventLog(
 ): AsyncIterableIterator<ChatEvent> {
     if (!params) params = {}
 
-    const channel = normalizeToInputChannel(await this.resolvePeer(chatId))
-    if (!channel) throw new MtInvalidPeerTypeError(chatId, 'channel')
+    const channel = normalizeToInputChannel(await this.resolvePeer(chatId), chatId)
 
     let current = 0
     let maxId = params.maxId ?? Long.ZERO
diff --git a/packages/client/src/methods/chats/join-chat.ts b/packages/client/src/methods/chats/join-chat.ts
index 6a67aee7..a3b822b6 100644
--- a/packages/client/src/methods/chats/join-chat.ts
+++ b/packages/client/src/methods/chats/join-chat.ts
@@ -37,12 +37,9 @@ export async function joinChat(
         }
     }
 
-    const peer = normalizeToInputChannel(await this.resolvePeer(chatId))
-    if (!peer) throw new MtNotFoundError()
-
     const res = await this.call({
         _: 'channels.joinChannel',
-        channel: peer,
+        channel: normalizeToInputChannel(await this.resolvePeer(chatId), chatId),
     })
 
     assertIsUpdatesGroup('channels.joinChannel', res)
diff --git a/packages/client/src/methods/chats/set-chat-username.ts b/packages/client/src/methods/chats/set-chat-username.ts
index ee2d8786..0c17ad87 100644
--- a/packages/client/src/methods/chats/set-chat-username.ts
+++ b/packages/client/src/methods/chats/set-chat-username.ts
@@ -16,12 +16,9 @@ export async function setChatUsername(
     chatId: InputPeerLike,
     username: string | null
 ): Promise<void> {
-    const chat = normalizeToInputChannel(await this.resolvePeer(chatId))
-    if (!chat) throw new MtInvalidPeerTypeError(chatId, 'channel')
-
     await this.call({
         _: 'channels.updateUsername',
-        channel: chat,
+        channel: normalizeToInputChannel(await this.resolvePeer(chatId), chatId),
         username: username || '',
     })
 }
diff --git a/packages/client/src/methods/chats/set-slow-mode.ts b/packages/client/src/methods/chats/set-slow-mode.ts
index 8fcc2858..efc224ca 100644
--- a/packages/client/src/methods/chats/set-slow-mode.ts
+++ b/packages/client/src/methods/chats/set-slow-mode.ts
@@ -17,12 +17,9 @@ export async function setSlowMode(
     chatId: InputPeerLike,
     seconds = 0
 ): Promise<void> {
-    const chat = normalizeToInputChannel(await this.resolvePeer(chatId))
-    if (!chat) throw new MtInvalidPeerTypeError(chatId, 'channel')
-
     const res = await this.call({
         _: 'channels.toggleSlowMode',
-        channel: chat,
+        channel: normalizeToInputChannel(await this.resolvePeer(chatId), chatId),
         seconds,
     })
     this._handleUpdate(res)
diff --git a/packages/client/src/methods/contacts/add-contact.ts b/packages/client/src/methods/contacts/add-contact.ts
index aea7bf38..6869e4b3 100644
--- a/packages/client/src/methods/contacts/add-contact.ts
+++ b/packages/client/src/methods/contacts/add-contact.ts
@@ -36,8 +36,7 @@ export async function addContact(
         sharePhone?: boolean
     }
 ): Promise<User> {
-    const peer = normalizeToInputUser(await this.resolvePeer(userId))
-    if (!peer) throw new MtInvalidPeerTypeError(userId, 'user')
+    const peer = normalizeToInputUser(await this.resolvePeer(userId), userId)
 
     const res = await this.call({
         _: 'contacts.addContact',
diff --git a/packages/client/src/methods/invite-links/get-invite-links.ts b/packages/client/src/methods/invite-links/get-invite-links.ts
index 0c88a926..901836ab 100644
--- a/packages/client/src/methods/invite-links/get-invite-links.ts
+++ b/packages/client/src/methods/invite-links/get-invite-links.ts
@@ -53,9 +53,7 @@ export async function* getInviteLinks(
     const chunkSize = Math.min(params.chunkSize ?? 100, total)
 
     const peer = await this.resolvePeer(chatId)
-    const admin = normalizeToInputUser(await this.resolvePeer(adminId))
-
-    if (!admin) throw new MtInvalidPeerTypeError(adminId, 'user')
+    const admin = normalizeToInputUser(await this.resolvePeer(adminId), adminId)
 
     let offsetDate: number | undefined = undefined
     let offsetLink: string | undefined = undefined
diff --git a/packages/client/src/methods/invite-links/hide-all-join-requests.ts b/packages/client/src/methods/invite-links/hide-all-join-requests.ts
index e1594781..e415d8ed 100644
--- a/packages/client/src/methods/invite-links/hide-all-join-requests.ts
+++ b/packages/client/src/methods/invite-links/hide-all-join-requests.ts
@@ -18,10 +18,7 @@ export async function hideAllJoinRequests(
     action: 'approve' | 'deny',
     link?: string
 ): Promise<void> {
-    const userId = normalizeToInputUser(await this.resolvePeer(user))
-    if (!userId) {
-        throw new MtInvalidPeerTypeError(user, 'user')
-    }
+    const userId = normalizeToInputUser(await this.resolvePeer(user), user)
 
     await this.call({
         _: 'messages.hideAllChatJoinRequests',
diff --git a/packages/client/src/methods/invite-links/hide-join-request.ts b/packages/client/src/methods/invite-links/hide-join-request.ts
index fc71c497..4046ed67 100644
--- a/packages/client/src/methods/invite-links/hide-join-request.ts
+++ b/packages/client/src/methods/invite-links/hide-join-request.ts
@@ -16,10 +16,7 @@ export async function hideJoinRequest(
     user: InputPeerLike,
     action: 'approve' | 'deny'
 ): Promise<void> {
-    const userId = normalizeToInputUser(await this.resolvePeer(user))
-    if (!userId) {
-        throw new MtInvalidPeerTypeError(user, 'user')
-    }
+    const userId = normalizeToInputUser(await this.resolvePeer(user), user)
 
     await this.call({
         _: 'messages.hideChatJoinRequest',
diff --git a/packages/client/src/methods/messages/get-messages.ts b/packages/client/src/methods/messages/get-messages.ts
index 603d3d7f..57b2e853 100644
--- a/packages/client/src/methods/messages/get-messages.ts
+++ b/packages/client/src/methods/messages/get-messages.ts
@@ -74,7 +74,7 @@ export async function getMessages(
             ? {
                   _: 'channels.getMessages',
                   id: ids,
-                  channel: normalizeToInputChannel(peer)!,
+                  channel: normalizeToInputChannel(peer),
               }
             : {
                   _: 'messages.getMessages',
diff --git a/packages/client/src/methods/messages/parse-entities.ts b/packages/client/src/methods/messages/parse-entities.ts
index 6a189ad8..9a15ea09 100644
--- a/packages/client/src/methods/messages/parse-entities.ts
+++ b/packages/client/src/methods/messages/parse-entities.ts
@@ -41,7 +41,8 @@ export async function _parseEntities(
         if (ent._ === 'messageEntityMentionName') {
             try {
                 const inputPeer = normalizeToInputUser(
-                    await this.resolvePeer(ent.userId)
+                    await this.resolvePeer(ent.userId),
+                    ent.userId
                 )
 
                 // not a user
diff --git a/packages/client/src/methods/stickers/create-sticker-set.ts b/packages/client/src/methods/stickers/create-sticker-set.ts
index 95ef59c0..3af844e2 100644
--- a/packages/client/src/methods/stickers/create-sticker-set.ts
+++ b/packages/client/src/methods/stickers/create-sticker-set.ts
@@ -106,8 +106,7 @@ export async function createStickerSet(
         )
     }
 
-    const owner = normalizeToInputUser(await this.resolvePeer(params.owner))
-    if (!owner) throw new MtInvalidPeerTypeError(params.owner, 'user')
+    const owner = normalizeToInputUser(await this.resolvePeer(params.owner), params.owner)
 
     const inputStickers: tl.TypeInputStickerSetItem[] = []
 
diff --git a/packages/client/src/methods/updates.ts b/packages/client/src/methods/updates.ts
index 5db04384..f909d3cd 100644
--- a/packages/client/src/methods/updates.ts
+++ b/packages/client/src/methods/updates.ts
@@ -1800,7 +1800,7 @@ async function _fetchChannelDifference(
     try {
         channel = normalizeToInputChannel(
             await this.resolvePeer(toggleChannelIdMark(channelId))
-        )!
+        )
     } catch (e) {
         this._updsLog.warn(
             'fetchChannelDifference failed for channel %d: input peer not found',
diff --git a/packages/client/src/methods/users/get-common-chats.ts b/packages/client/src/methods/users/get-common-chats.ts
index 74953972..8861cc1a 100644
--- a/packages/client/src/methods/users/get-common-chats.ts
+++ b/packages/client/src/methods/users/get-common-chats.ts
@@ -14,12 +14,9 @@ export async function getCommonChats(
     this: TelegramClient,
     userId: InputPeerLike
 ): Promise<Chat[]> {
-    const peer = normalizeToInputUser(await this.resolvePeer(userId))
-    if (!peer) throw new MtInvalidPeerTypeError(userId, 'user')
-
     return this.call({
         _: 'messages.getCommonChats',
-        userId: peer,
+        userId: normalizeToInputUser(await this.resolvePeer(userId), userId),
         maxId: 0,
         limit: 100,
     }).then((res) => res.chats.map((it) => new Chat(this, it)))
diff --git a/packages/client/src/methods/users/get-profile-photos.ts b/packages/client/src/methods/users/get-profile-photos.ts
index 56950944..79cc9fba 100644
--- a/packages/client/src/methods/users/get-profile-photos.ts
+++ b/packages/client/src/methods/users/get-profile-photos.ts
@@ -33,12 +33,9 @@ export async function getProfilePhotos(
 ): Promise<Photo[]> {
     if (!params) params = {}
 
-    const peer = normalizeToInputUser(await this.resolvePeer(userId))
-    if (!peer) throw new MtInvalidPeerTypeError(userId, 'user')
-
     const res = await this.call({
         _: 'photos.getUserPhotos',
-        userId: peer,
+        userId: normalizeToInputUser(await this.resolvePeer(userId), userId),
         offset: params.offset ?? 0,
         limit: params.limit ?? 100,
         maxId: Long.ZERO,
diff --git a/packages/client/src/methods/users/iter-profile-photos.ts b/packages/client/src/methods/users/iter-profile-photos.ts
index cca034a8..f5e10797 100644
--- a/packages/client/src/methods/users/iter-profile-photos.ts
+++ b/packages/client/src/methods/users/iter-profile-photos.ts
@@ -46,8 +46,7 @@ export async function* iterProfilePhotos(
 ): AsyncIterableIterator<Photo> {
     if (!params) params = {}
 
-    const peer = normalizeToInputUser(await this.resolvePeer(userId))
-    if (!peer) throw new MtInvalidPeerTypeError(userId, 'user')
+    const peer = normalizeToInputUser(await this.resolvePeer(userId), userId)
 
     let offset = params.offset || 0
     let current = 0
diff --git a/packages/client/src/types/bots/keyboards.ts b/packages/client/src/types/bots/keyboards.ts
index b5159397..c5424518 100644
--- a/packages/client/src/types/bots/keyboards.ts
+++ b/packages/client/src/types/bots/keyboards.ts
@@ -362,15 +362,10 @@ export namespace BotKeyboard {
         text: string,
         user: tl.TypeInputPeer
     ): tl.RawInputKeyboardButtonUserProfile {
-        const userId = normalizeToInputUser(user)
-        if (!userId) {
-            throw new MtInvalidPeerTypeError(user, 'user')
-        }
-
         return {
             _: 'inputKeyboardButtonUserProfile',
             text,
-            userId,
+            userId: normalizeToInputUser(user),
         }
     }
 
diff --git a/packages/client/src/utils/peer-utils.ts b/packages/client/src/utils/peer-utils.ts
index abbe0996..47f298bd 100644
--- a/packages/client/src/utils/peer-utils.ts
+++ b/packages/client/src/utils/peer-utils.ts
@@ -1,6 +1,7 @@
 import Long from 'long'
 import { tl } from '@mtcute/tl'
 import { assertNever } from '@mtcute/core'
+import { InputPeerLike, MtInvalidPeerTypeError } from '../types'
 
 export const INVITE_LINK_REGEX =
     /^(?:https?:\/\/)?(?:www\.)?(?:t(?:elegram)?\.(?:org|me|dog)\/(?:joinchat\/|\+))([\w-]+)$/i
@@ -50,18 +51,9 @@ export function normalizeToInputPeer(
 }
 
 export function normalizeToInputUser(
-    res:
-        | tl.TypeInputUser
-        | tl.RawInputPeerUser
-        | tl.RawInputPeerUserFromMessage
-        | tl.RawInputPeerSelf
-): tl.TypeInputUser
-export function normalizeToInputUser(
-    res: tl.TypeInputPeer | tl.TypeInputUser | tl.TypeInputChannel
-): tl.TypeInputUser | null
-export function normalizeToInputUser(
-    res: tl.TypeInputPeer | tl.TypeInputUser | tl.TypeInputChannel
-): tl.TypeInputUser | null {
+    res: tl.TypeInputPeer | tl.TypeInputUser | tl.TypeInputChannel,
+    input?: InputPeerLike
+): tl.TypeInputUser {
     if (tl.isAnyInputUser(res)) return res
 
     switch (res._) {
@@ -82,21 +74,13 @@ export function normalizeToInputUser(
             }
     }
 
-    return null
+    throw new MtInvalidPeerTypeError(input ?? res, 'user')
 }
 
 export function normalizeToInputChannel(
-    res:
-        | tl.TypeInputChannel
-        | tl.RawInputPeerChannel
-        | tl.RawInputPeerChannelFromMessage
-): tl.TypeInputChannel
-export function normalizeToInputChannel(
-    res: tl.TypeInputPeer | tl.TypeInputUser | tl.TypeInputChannel
-): tl.TypeInputChannel | null
-export function normalizeToInputChannel(
-    res: tl.TypeInputPeer | tl.TypeInputUser | tl.TypeInputChannel
-): tl.TypeInputChannel | null {
+    res: tl.TypeInputPeer | tl.TypeInputUser | tl.TypeInputChannel,
+    input?: InputPeerLike
+): tl.TypeInputChannel {
     if (tl.isAnyInputChannel(res)) return res
 
     switch (res._) {
@@ -115,7 +99,7 @@ export function normalizeToInputChannel(
             }
     }
 
-    return null
+    throw new MtInvalidPeerTypeError(input ?? res, 'user')
 }
 
 export function isInputPeerUser(