Unfortunately, it would be a real PIA, laborious and totally manual effort. It can be done, but a lot of export, source tweaking and then import operations.
It might be simpler to migrate a working version of your application in its previous older PB version to PB 12.5.x and then just reapply your recent changes.
Your only other alternative might be to add a plethira of TRY..CATCH statements to at least stop the crashing and exit in a controlled fashion (and gather more error information).