@20100 @feequs Hi and welcome to the community. 
I am a community member too. I can’t really help, just providing some additional information you may not be aware of that may help.
This issue may be originating with chromium and not particularly Brave. Have you tried opening a different chromium based browser to see if you get the same message?
I couldn’t find any recent open issues doing a search on Brave Community topics, Brave reddit community, or Brave GitHub issues. However, there have been recent posts in other reddit communities which make me think this may be a chromium regression.
This error seems to have been popping up in chrome previously. Posting two links below that provide information for correcting.
Please make sure you have backed up your Brave-Browser folder, preferably to an external device, especially if you are changing or deleting information from the Braver-Browser/User Data folder. You can restore the Brave-Browser folder if you lose your Rewards information and may be able to restore any earnings and/or balances if your Rewards are unverified. Your Brave Profile Path can be found at brave://version.
Source: can i create bats backup? - #4 by CerealLover
Note: Consider backing up entire Brave-Browser folder too and not just User Data folder.
Hope this helps!