Ok, so it|s a bit of a weird one but then again it may just be me being untalented (Hope I chose the correct category here, it’s not strictly speaking add on related… I think)… So, I downgraded anki to 2.1.35 (upgrading would definetely be a solution, I know) in order to use Migaku.
Migaku is fine but now I keep getting an error message whenever I try to use the filter function in browse but only if I use Hangul. It’s fine when I use latin letters for some reason. I have tried disabling all addons and I have tried checking the database as the second error message I got after that suggested.
If anyone could help me, I’d be really grateful, since I found migaku to be very helpful and don’t want to upgrade again 
… excpet if there is a way to use migaku in the upgradet version of course.
(does it have something to do with the flags in anki 2.1.49?- I did flag a few cards before downgrading)
This would be the second error message:
Error
An error occurred. Please use Tools > Check Database to see if that fixes the problem.
If problems persist, please report the problem on our support site. Please copy and paste the information below into your report.
Anki 2.1.35 (84dcaa86) Python 3.8.0 Qt 5.14.2 PyQt 5.14.2
Platform: Windows 10
Flags: frz=True ao=False sv=2
Add-ons, last update check: 2022-01-31 06:10:52
Caught exception:
Traceback (most recent call last):
File “aqt\browser.py”, line 416, in paint
File “aqt\theme.py”, line 96, in qcolor
File “aqt\theme.py”, line 91, in str_color
Exception: (‘no such color:’, ‘flag6-bg’)
Caught exception:
Traceback (most recent call last):
File “aqt\browser.py”, line 416, in paint
File “aqt\theme.py”, line 96, in qcolor
File “aqt\theme.py”, line 91, in str_color
Exception: (‘no such color:’, ‘flag6-bg’)
Caught exception:
Traceback (most recent call last):
File “aqt\browser.py”, line 416, in paint
File “aqt\theme.py”, line 96, in qcolor
File “aqt\theme.py”, line 91, in str_color
Exception: (‘no such color:’, ‘flag6-bg’)
Caught exception:
Traceback (most recent call last):
File “aqt\browser.py”, line 416, in paint
File “aqt\theme.py”, line 96, in qcolor
File “aqt\theme.py”, line 91, in str_color
Exception: (‘no such color:’, ‘flag6-bg’)
Caught exception:
Traceback (most recent call last):
File “aqt\browser.py”, line 416, in paint
File “aqt\theme.py”, line 96, in qcolor
File “aqt\theme.py”, line 91, in str_color
Exception: (‘no such color:’, ‘flag6-bg’)
Caught exception:
Traceback (most recent call last):
File “aqt\browser.py”, line 416, in paint
File “aqt\theme.py”, line 96, in qcolor
File “aqt\theme.py”, line 91, in str_color
Exception: (‘no such color:’, ‘flag6-bg’)
Thank you so much!