No idea. Without the full error message (file path and line number) of no clue where the error occurred exactly.
Is it safe to downgrade to the previous version until this is fixed?
It is absolutely never safe to downgrade. We do not have downgrade migrations and never will. All installs are 1 way unless you've a backup to restore to. Do not downgrade, ever, as you are likely to break even more things in doing so.