Urgent help needed! App crashes on older devices.

Hello, we release out app few days ago ,yesterday we found out that it's crashing after the splash screen on Iphone 6 and Ipad 3 i'ts working fine on devices like Iphone 6s,7 we tried to removed the metal api from the graphics api ,but that didn't resolve the issue. Here is what our Ipad testflight tester send us.