diff --git a/script/RobotTCP.py b/script/RobotTCP.py
index 6f257cf..6ff3e3c 100644
--- a/script/RobotTCP.py
+++ b/script/RobotTCP.py
@@ -405,7 +405,9 @@ class RobotTCP(TcpDevice, Stoppable):
             tasks.append(pro)
         for task in tasks:
             if self.get_task_status(task)[0]>=0:
+                time.sleep(0.2)
                 self.task_kill(task)
+                time.sleep(0.2)
 
     def get_task(self):
         if self.current_task is not None: