App crashes without any information

Hey,

I'm experiencing a weird issue which I can't resolve. A substantial amount of my users experience a crash which I log through Firebase Crashlytics and Organizer crash reports, but for some reason the crash log won't provide any information.

Does anyone experience this type of crash before? How do I get more information about it in order to solved it? What could be the cause?

Crash log

Crashed: com.apple.main-thread
0  LogoQuizAC                     0x1021d1218 _hidden#18_ + 146 (__hidden#957_:146)
1  LogoQuizAC                     0x1021c8d6c _hidden#17_ + 96 (__hidden#454_:96)
2  LogoQuizAC                     0x1021c8ea0 _hidden#20_ + 4332883616 (__hidden#456_:4332883616)
3  Foundation                     0x1821c0b20 __NSFireTimer + 68
4  CoreFoundation                 0x180da5fa0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 32
5  CoreFoundation                 0x180da5ba0 __CFRunLoopDoTimer + 1064
6  CoreFoundation                 0x180da4ffc __CFRunLoopDoTimers + 328
7  CoreFoundation                 0x180d9eee4 __CFRunLoopRun + 1936
8  CoreFoundation                 0x180d9e21c CFRunLoopRunSpecific + 600
9  GraphicsServices               0x19896b784 GSEventRunModal + 164
10 UIKitCore                      0x1837deee8 -[UIApplication _run] + 1072
11 UIKitCore                      0x1837e475c UIApplicationMain + 168
12 LogoQuizAC                     0x102006404 main + 21 (RLockedCell.swift:21)
13 libdyld.dylib                  0x180a5e6b0 start + 4