IndexError: list index out of range

[Saumya-Mishra9129]

Traceback (most recent call last):
File "/usr/bin/sugar-activity3", line 5, in
activityinstance.main()
File "/usr/lib/python3/dist-packages/sugar3/activity/activityinstance.py", line 230, in main
instance = create_activity_instance(activity_constructor, activity_handle)
File "/usr/lib/python3/dist-packages/sugar3/activity/activityinstance.py", line 59 , in create_activity_instance
activity = constructor(handle)
File "/usr/share/sugar/activities/mastermind-activity/activity.py", line 54, in init
self.read_file()
File "/usr/share/sugar/activities/mastermind-activity/activity.py", line 128, in read_file
current.append(data["balls"][x][data["level"]])
IndexError: list index out of range

Steps to produce - Play a game till end i.e. complete whole board , press stop button to exit from activity , resume activity from journal check in logs.