mw.col.sched.dayCutoff - 86400 * no_days) * 1000 - AttributeError: 'NoneType' object has no attribute 'sched'

[MultivariatePerspective]

W10x64
Anki Version ⁨2.1.54 (b6a7760c)⁩
Python 3.9.7 Qt 6.3.1 PyQt 6.3.1

Having the following exception upon start:

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 to the add-on author.
Debug info:
Anki 2.1.54 (b6a7760c) Python 3.9.7 Qt 6.3.1 PyQt 6.3.1
Platform: Windows 10
Flags: frz=True ao=True sv=?
Add-ons, last update check: 2022-12-30 06:50:03

Caught exception:
Traceback (most recent call last):
File "aqt.progress", line 118, in handler
File "aqt.main", line 198, in on_window_init
File "aqt.hooks_gen", line 2801, in call
File "C:\Users\Sony\AppData\Roaming\Anki2\addons21\1097423555\reviewer_progress_bar.py", line 167, in add_info
x = (mw.col.sched.dayCutoff - 86400 * no_days) * 1000
AttributeError: 'NoneType' object has no attribute 'sched'