KeyError

[Lick-Lee]

Hello, @martinruenz. Have you met this problem?
When I ran MaskFusion with two GPUs, there had this problem.
First, it will stop before the end.(This data is in the bottom-left of the GUI )

Log 723/755

Second, when I closed the GUI, in the terminal, there had this error.

Exception ignored in: <module 'threading' from '/usr/lib/python3.5/threading.py'>
Traceback (most recent call last):
File "/usr/lib/python3.5/threading.py", line 1290, in _shutdown
_main_thread._delete()
File "/usr/lib/python3.5/threading.py", line 1013, in _delete
del _active[get_ident()]
KeyError: 140619725679744
terminate called without an active exception
已放弃 (核心已转储)

I think maybe the thread of MaskRCNN is still running, so the thread of MaskRCNN can't be closed. But I have no idea to solve it.
What should I do to solve this problem?
Thank you!