Hello just a big that happened to me few days ago..

[Bluegalaxy7]

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.
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Debug info:
Anki 2.1.15 (442df9d6) Python 3.6.7 Qt 5.12.1 PyQt 5.11.3
Platform: Windows 10
Flags: frz=True ao=True sv=1

Caught exception:
File "C:\Users\blueg\AppData\Roaming\Anki2\addons21\24411424\custom_shortcuts.py", line 137, in
(config_scuts["reviewer choice 2"], lambda: self._answerCard(2)),
File "aqt\reviewer.py", line 240, in _answerCard
File "C:\Users\blueg\AppData\Roaming\Anki2\addons21\864545277\controller.py", line 99, in wrapped
originalFunction(self)
File "aqt\reviewer.py", line 91, in nextCard
File "aqt\main.py", line 488, in moveToState
File "anki\hooks.py", line 29, in runHook
File "C:\Users\blueg\AppData\Roaming\Anki2\addons21\811976365\TomatoClock\TomatoClock.py", line 112, in after_anki_state_change
self.on_tomato(False)
File "C:\Users\blueg\AppData\Roaming\Anki2\addons21\811976365\TomatoClock\TomatoClock.py", line 119, in on_tomato
self.pb_w.hide()
<class 'AttributeError'>: 'NoneType' object has no attribute 'hide'