Why EXC_BAD_ACCESS when authorizing through classmates in different places on iPhone and iPad?

Question

Apple Xcode

I don’t have much experience in objective c, so I’m asking for help
In the first screenshot, the error occurs on the iPhone 6

In the second screenshot, the error occurs on the iPad

This error in both cases occurs when authorizing in my application through classmates
The classmates application is not located anywhere
Why does the error occur in different places? and how to bypass it?