Unity game crash on iphone start-up log

My unity game crashed on iphone start-up. It doesn't always happen and happened on my old iPhone(IOS 15.5 version), but not on another old iphone( IOS 14.8.1 version). This is the crash log. I don't understand the log. Can you help me? Many Thanks.

To sum up:

  1. Unity game crash on iPhone when start-up
  2. Only happens on the iPhone which is IOS 15.5 version, but not on another iPhone which is IOS 14.8.1 version. Both are old iPhone devices
  3. Not always happens, it happens by chance.

It turns out Firebase SDK problem. After updating to the latest Firebase SDK version 9.0, there is no crash on IOS. https://github.com/firebase/firebase-cpp-sdk/issues/700

I have the same error except I don't have firebase, what do you suggest?

Unity game crash on iphone start-up log
 
 
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