Update app.py

app.py

@@ -104,9 +104,9 @@ class MyClient(discord.Client):
             self.is_processing = False
 
     def is_message_in_specific_channel(self, message):
-        return message.channel.id == SPECIFIC_CHANNEL_ID or (
+        return isinstance(message.channel, discord.TextChannel) and (message.channel.id == SPECIFIC_CHANNEL_ID or (
             isinstance(message.channel, discord.Thread) and message.channel.parent_id == SPECIFIC_CHANNEL_ID
-        )
+        ))
 
     def is_math_question(self, content):
         return bool(re.search(r'\b(solve|equation|calculate|math)\b', content, re.IGNORECASE))