diff --git a/channel/chat_channel.py b/channel/chat_channel.py
index 1fcc619..815b201 100644
--- a/channel/chat_channel.py
+++ b/channel/chat_channel.py
@@ -97,7 +97,7 @@ class ChatChannel(Channel):
                         logger.info("[WX]receive group voice, but checkprefix didn't match")
                     return None
             else: # 单聊
-                match_prefix = check_prefix(content, conf().get('single_chat_prefix'))  
+                match_prefix = check_prefix(content, conf().get('single_chat_prefix',['']))
                 if match_prefix is not None: # 判断如果匹配到自定义前缀，则返回过滤掉前缀+空格后的内容
                     content = content.replace(match_prefix, '', 1).strip()
                 elif context["origin_ctype"] == ContextType.VOICE: # 如果源消息是私聊的语音消息，允许不匹配前缀，放宽条件
@@ -305,6 +305,8 @@ class ChatChannel(Channel):
     
 
 def check_prefix(content, prefix_list):
+    if not prefix_list:
+        return None
     for prefix in prefix_list:
         if content.startswith(prefix):
             return prefix