How to reproduce an application crash?

Question

Objective-C

I sent the application for approval, got a rejection due to a crash at startup, while the crash could not be reproduced. The crash log that was sent to me didn't say anything.
In which direction to dig to reproduce the crash?
rghost.ru/58788522 - Crash log

Answer 1

here is the most important info

Code Type:           ARM-64 (Native)
OS Version:          iOS 8.1 (12B410)
Thread 0 Crashed:
4   RND                           	0x0000000100126c5c 0x1000d4000 + 339036
5   CoreFoundation                	0x0000000187bde204 __handleUncaughtException + 688

on iOS 8.1, an exeption occurred on a 64-bit device that was not processed
1. the first thing to do is take a 64-bit device with ios 8.1 and run 2 on
it. 339036 3. if it doesn't help, then see what code is doing what at startup, analyze where the exeption could have happened 4. cover the code with try-catch - insert logs and upload the application