diff --git a/script/RobotTCP.py b/script/RobotTCP.py
index b2f924f..e1bf37d 100644
--- a/script/RobotTCP.py
+++ b/script/RobotTCP.py
@@ -386,7 +386,7 @@ class RobotTCP(TcpDevice, Stoppable):
         self.task_create(program, *args, **kwargs)
 
     def stop_task(self):
-        for task in (self.high_level_tasks + [current_task]):
+        for task in (self.high_level_tasks + [self.current_task]):
             if (task is not None) and (self.get_task_status(task)[0]>=0):
                 self.task_kill(task)