failed on 2.1.23(btw the addon is awesome)

[Sheldontao]

Error
An error occurred. Please start Anki while holding down the shift key, which will temporarily disable the add-ons you have installed.
If the issue only occurs when add-ons are enabled, please use the Tools > Add-ons menu item to disable some add-ons and restart Anki, repeating until you discover the add-on that is causing the problem.
When you've discovered the add-on that is causing the problem, please report the issue on the add-on support site.
Debug info:
Anki 2.1.23 (de9543ff) Python 3.8.0 Qt 5.13.1 PyQt 5.14.1
Platform: Mac 10.15.7
Flags: frz=True ao=True sv=1
Add-ons, last update check: 2020-10-24 19:58:09
Add-ons possibly involved: ⁨811976365_1⁩

Caught exception:
Traceback (most recent call last):
File "aqt/webview.py", line 446, in handler
File "aqt/reviewer.py", line 329, in _onAnswerButton
File "</Applications/Anki.app/Contents/MacOS/decorator.pyc:decorator-gen-10>", line 2, in _answerCard
File "anki/hooks.py", line 666, in decorator_wrapper
File "anki/hooks.py", line 661, in repl
File "aqt/reviewer.py", line 270, in _answerCard
File "aqt/reviewer.py", line 103, in nextCard
File "aqt/main.py", line 591, in moveToState
File "aqt/gui_hooks.py", line 1538, in call
File "anki/hooks.py", line 611, in runHook
File "/Users/taiyangxiang/Library/Application Support/Anki2/addons21/811976365_1/TomatoClock/TomatoClock.py", line 112, in after_anki_state_change
self.on_tomato(False)
File "/Users/taiyangxiang/Library/Application Support/Anki2/addons21/811976365_1/TomatoClock/TomatoClock.py", line 119, in on_tomato
self.pb_w.hide()
AttributeError: 'NoneType' object has no attribute 'hide'