diff --git a/channel/telegram/telegram_channel.py b/channel/telegram/telegram_channel.py
index 5cf1707..795a409 100644
--- a/channel/telegram/telegram_channel.py
+++ b/channel/telegram/telegram_channel.py
@@ -66,9 +66,10 @@ class TelegramChannel(Channel):
         except Exception as e:
             logger.exception(e)
 
-        
-    def check_prefix(self,msg,prefix_list):
+    def check_prefix(self, msg, prefix_list):
+        if not prefix_list:
+            return None
         for prefix in prefix_list:
             if msg.text.startswith(prefix):
                 return prefix
-        return None
\ No newline at end of file
+        return None