fix:check_history_event (#386)

Author: zhongxiao-myshell

servers/automata.py

@@ -514,7 +514,7 @@ def check_history_event(e):
         if isinstance(event_name, str) and sess_state.event_mapping.get(e) is not None:
             return False
         tmp = e.split('_')
-        if len(tmp.split('_')) == 4 and tmp[0] == "MESSAGE" and tmp[2] == "BUTTON":
+        if len(tmp) == 4 and tmp[0] == "MESSAGE" and tmp[2] == "BUTTON":
             return True
         return False