App crashes when runs on ios (exc_bad_access)

Hi!

When I run my game from xcode to iphone 4 or iphone 4s I get this
Thread 1: EXC_BAD_ACCESS(code=1, address=0xa001800c) at main.mm

I'm searching the web many hours now and I've found no solution.
Does anyone know what am I doing wrong?

I'm using unity 4.7, xcode 7.2
plugins for unity (Google Mobile Ads SDK and Facebook)