Fatal Error keeps occurring

It keeps giving me a fatal error in battles for some reason. Anything I can do to fix this?
Using 4x speed, holding A to speed battles up aswell.
Playing on Samsung Galaxy S9+.

Do you have the Last Stand trait on your team? That will cause a crash sometimes right now.

I don’t have Last Stand trait. It has never happend before until I got Imp Necromancer on my team(Darkness Fate trait).
I’ve gotten this Fatal Error 4 times so far.