[Update] 修改小bug

coco/app.py

@@ -85,7 +85,7 @@ class Coco:
 
     @ignore_error
     def heartbeat(self):
-        _sessions = [s.to_json() for s in Session.sessions.values()]
+        _sessions = [s.to_json() for s in Session.sessions.values() if s]
         tasks = app_service.terminal_heartbeat(_sessions)
         if tasks:
             self.handle_task(tasks)

coco/session.py

@@ -56,9 +56,9 @@ class Session:
         session = cls.get_session(sid)
         if session:
             session.close()
-        app_service.finish_session(session.to_json())
-        app_service.finish_replay(sid)
-        del cls.sessions[sid]
+            app_service.finish_session(session.to_json())
+            app_service.finish_replay(sid)
+            del cls.sessions[sid]
 
     def add_watcher(self, watcher, silent=False):
         """