diff --git a/packages/core/src/network/session-connection.ts b/packages/core/src/network/session-connection.ts
index 9508640b..38386072 100644
--- a/packages/core/src/network/session-connection.ts
+++ b/packages/core/src/network/session-connection.ts
@@ -1771,7 +1771,6 @@ export class SessionConnection extends PersistentConnection {
         }
 
         const result = writer.result()
-        // probably the easiest way lol
 
         this.log.debug(
             'sending %d messages: size = %db, acks = %d (msg_id = %s), ping = %s (msg_id = %s), state_req = %s (msg_id = %s), resend = %s (msg_id = %s), cancels = %s (msg_id = %s), rpc = %s, container = %s, root msg_id = %l',
@@ -1800,7 +1799,9 @@ export class SessionConnection extends PersistentConnection {
             if (ackMsgIds) {
                 this._session.queuedAcks.splice(0, 0, ...ackMsgIds)
             }
-            this._onMessageFailed(rootMsgId!, 'unknown error')
+            if (rootMsgId) {
+                this._onMessageFailed(rootMsgId, 'unknown error')
+            }
         })
     }
 }
diff --git a/packages/core/src/network/transports/tcp.ts b/packages/core/src/network/transports/tcp.ts
index 3954f1f3..7d7ed217 100644
--- a/packages/core/src/network/transports/tcp.ts
+++ b/packages/core/src/network/transports/tcp.ts
@@ -116,12 +116,12 @@ export abstract class BaseTcpTransport extends EventEmitter implements ITelegram
     }
 
     async send(bytes: Uint8Array): Promise<void> {
+        const framed = await this._packetCodec.encode(bytes)
+
         if (this._state !== TransportState.Ready) {
             throw new MtcuteError('Transport is not READY')
         }
 
-        const framed = await this._packetCodec.encode(bytes)
-
         return new Promise((resolve, reject) => {
             this._socket!.write(framed, (error) => {
                 if (error) {