related discussion in better bibtex https://forums.zotero.org/discussion/89887/error-an-error-has-occurred-please-restart-zotero-does-not-resolve-upon-restart
and its issue retorquere/zotero-better-bibtex#1821
However, the commit is massive and opaque as to the cause of the error
this commit appears to fix the problem... ¯\_(ツ)_/¯