Firebase Crashlytics shows a weird crash on iOS app, I can't understand what causing it:
Crashed: com.apple.main-thread
0 LogoQuizAC 0x10047f6a0 _hidden#18_ + 135 (__hidden#957_:135)
1 LogoQuizAC 0x1004771f4 _hidden#17_ + 96 (__hidden#454_:96)
2 LogoQuizAC 0x100477328 _hidden#20_ + 4304712488 (__hidden#456_:4304712488)
3 Foundation 0x19b094b20 __NSFireTimer + 68
4 CoreFoundation 0x199c79fa0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 32
5 CoreFoundation 0x199c79ba0 __CFRunLoopDoTimer + 1064
6 CoreFoundation 0x199c78ffc __CFRunLoopDoTimers + 328
7 CoreFoundation 0x199c72ee4 __CFRunLoopRun + 1936
8 CoreFoundation 0x199c7221c CFRunLoopRunSpecific + 600
9 GraphicsServices 0x1b183e784 GSEventRunModal + 164
10 UIKitCore 0x19c6b2ee8 -[UIApplication _run] + 1072
11 UIKitCore 0x19c6b875c UIApplicationMain + 168
12 LogoQuizAC 0x1002b503c main + 20 (RLockedCell.swift:20)
13 libdyld.dylib 0x1999326b0 start + 4
How can I figure it out? any strategy of solving this issue?