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Hi there,I hope I'm posting this question in the right category.I develop a Clock app for macOS which is on the Mac App Store. Just within the last week, a user from Switzerland got in touch with me about some issues he was having. At first, I thought the set of issues he was experiencing had to do with some problems I had recently been dealing with. An update was on the way and assured him that the update would most assuredly fix his problems, but if it didn't, he could email me back. Unfortunately, he emailed me back telling me that the entire app was now broken, it was crashing on launch. I did quite a bit of troubleshooting after that trying to reproduce the problem but wasn't able to. This is also the only incident of this kind that I know of, no one else has contacted me with this problem. He sent me the crash log and I watched this presentation at WWDC18 to learn more about crash logs. A lot of what was said went over my head, I'm no rocket scientist, but I think I got the gist of it and it has helped grow my brain somewhat. Nevertheless, I'm still really confused with the error that I'm dealing with.So here's the crash log:Process: Clock Pro [608] Path: /Applications/Clock Pro.app/Contents/MacOS/Clock Pro Identifier: com.mnccoding.Clock Version: 1.3.8 (46) App Item ID: 1107473342 App External ID: 833098719 Code Type: X86-64 (Native) Parent Process: ??? [1] Responsible: Clock Pro [608] User ID: 501 Date/Time: 2019-10-16 09:21:34.391 +0200 OS Version: Mac OS X 10.13.6 (17G8037) Report Version: 12 Anonymous UUID: DB6FF886-129B-CF54-B3CC-607E5BF9FEBA Time Awake Since Boot: 200 seconds System Integrity Protection: enabled Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_BAD_INSTRUCTION (SIGILL) Exception Codes: 0x0000000000000001, 0x0000000000000000 Exception Note: EXC_CORPSE_NOTIFY Termination Signal: Illegal instruction: 4 Termination Reason: Namespace SIGNAL, Code 0x4 Terminating Process: exc handler [0] Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.mnccoding.Clock 0x00000001005bab1d 0x1005b1000 + 39709 1 com.mnccoding.Clock 0x00000001005bb018 0x1005b1000 + 40984 2 com.apple.AppKit 0x00007fff35f9d20a -[NSViewController _sendViewDidLoad] + 97 3 com.apple.AppKit 0x00007fff36541afd _noteLoadCompletionForObject + 641 4 com.apple.AppKit 0x00007fff35f21945 -[NSIBObjectData nibInstantiateWithOwner:options:topLevelObjects:] + 2042 5 com.apple.AppKit 0x00007fff3601cd1e -[NSNib _instantiateNibWithExternalNameTable:options:] + 679 6 com.apple.AppKit 0x00007fff3601c97a -[NSNib _instantiateWithOwner:options:topLevelObjects:] + 136 7 com.apple.AppKit 0x00007fff3601bc50 -[NSViewController loadView] + 343 8 com.apple.AppKit 0x00007fff35f93a9e -[NSViewController _loadViewIfRequired] + 75 9 com.apple.AppKit 0x00007fff35f93a09 -[NSViewController view] + 30 10 com.apple.AppKit 0x00007fff36112365 -[NSWindow _contentViewControllerChanged] + 109 11 com.apple.Foundation 0x00007fff3aade6ce -[NSObject(NSKeyValueCoding) setValue:forKey:] + 331 12 com.apple.AppKit 0x00007fff361550c5 -[NSWindow setValue:forKey:] + 111 13 com.apple.AppKit 0x00007fff36155029 -[NSIBUserDefinedRuntimeAttributesConnector establishConnection] + 637 14 com.apple.AppKit 0x00007fff35f216e1 -[NSIBObjectData nibInstantiateWithOwner:options:topLevelObjects:] + 1430 15 com.apple.AppKit 0x00007fff3601cd1e -[NSNib _instantiateNibWithExternalNameTable:options:] + 679 16 com.apple.AppKit 0x00007fff3601c97a -[NSNib _instantiateWithOwner:options:topLevelObjects:] + 136 17 com.apple.AppKit 0x00007fff3677346c -[NSStoryboard instantiateControllerWithIdentifier:] + 236 18 com.apple.AppKit 0x00007fff35f159ef NSApplicationMain + 729 19 com.mnccoding.Clock 0x00000001005b4839 0x1005b1000 + 14393 20 libdyld.dylib 0x00007fff608ea015 start + 1Since my app is crashing on launch, I suspect that something in viewDidLoad( ) is causing it to crash, but I am unsure because I am not able to reproduce this issue and the above crash log is Greek to me.This is not the entire log, there are other threads as well, but since I have not set up my app for multithreading, I have not included them. I can also include my code in viewDidLoad( ) if that will be helpful.Help would be appreciated! I'm really confused!