iOSアプリをApp Storeの審査に提出したところ、We were unable to review your app as it crashed on launch.との理由でリジェクトされました。
実機で確認したところクラッシュが再現できないので、Appleから送られてきたクラッシュログを読んでいるのですが、何が原因で起動時にクラッシュするのかが分かりません。
実機はiPhone OS 10.3.3です。

MyAppというのが、私がつくっているアプリの名前になります。

Code Type:           ARM-64 (Native)
Role:                Foreground
Parent Process:      launchd [1]

OS Version:          iPhone OS 10.3.3 (14G60)
Report Version:      104

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note:  EXC_CORPSE_NOTIFY
Triggered by Thread:  0

Application Specific Information:
abort() called

Filtered syslog:
None found

Last Exception Backtrace:
0   CoreFoundation                  0x1840befe0 __exceptionPreprocess + 124
1   libobjc.A.dylib                 0x182b20538 objc_exception_throw + 56
2   CoreFoundation                  0x1840bef28 +[NSException raise:format:] + 116
3   Foundation                      0x184b25104 -[NSBundle initWithURL:] + 104
4   Foundation                      0x184b25088 +[NSBundle bundleWithURL:] + 48
5   MyApp                   0x10043c824 0x1000e4000 + 3508260
6   MyApp                   0x10043c7ac 0x1000e4000 + 3508140
7   MyApp                   0x100224f30 0x1000e4000 + 1314608
8   libdispatch.dylib               0x182f769a0 _dispatch_client_callout + 16
9   libdispatch.dylib               0x182f776cc dispatch_once_f + 56
10  MyApp                   0x100224e6c 0x1000e4000 + 1314412
11  MyApp                   0x1002214b4 0x1000e4000 + 1299636
12  MyApp                   0x1002213f0 0x1000e4000 + 1299440
13  MyApp                   0x100222888 0x1000e4000 + 1304712
14  MyApp                   0x1002138b4 0x1000e4000 + 1243316
15  MyApp                   0x100213020 0x1000e4000 + 1241120
16  MyApp                   0x100212e60 0x1000e4000 + 1240672
17  MyApp                   0x1000ea83c 0x1000e4000 + 26684
18  MyApp                   0x1000eb2a4 0x1000e4000 + 29348
19  UIKit                           0x18a1e9b04 -[UIViewController loadViewIfRequired] + 1036
20  UIKit                           0x18a1e96e0 -[UIViewController view] + 28
21  UIKit                           0x18a1eff60 -[UIWindow addRootViewControllerViewIfPossible] + 76
22  UIKit                           0x18a1ed3fc -[UIWindow _setHidden:forced:] + 272
23  UIKit                           0x18a25ee68 -[UIWindow makeKeyAndVisible] + 48
24  UIKit                           0x18a467430 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 3632
25  UIKit                           0x18a46ce24 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1684
26  UIKit                           0x18a4818b0 __84-[UIApplication _handleApplicationActivationWithScene:transitionContext:completion:]_block_invoke.3147 + 48
27  UIKit                           0x18a46a0b8 -[UIApplication workspaceDidEndTransaction:] + 168
28  FrontBoardServices              0x185c68884 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 36
29  FrontBoardServices              0x185c686f0 -[FBSSerialQueue _performNext] + 176
30  FrontBoardServices              0x185c68aa0 -[FBSSerialQueue _performNextFromRunLoopSource] + 56
31  CoreFoundation                  0x18406d42c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
32  CoreFoundation                  0x18406cd9c __CFRunLoopDoSources0 + 540
33  CoreFoundation                  0x18406a9a8 __CFRunLoopRun + 744
34  CoreFoundation                  0x183f9ada4 CFRunLoopRunSpecific + 424
35  UIKit                           0x18a253fc8 -[UIApplication _run] + 652
36  UIKit                           0x18a24ec9c UIApplicationMain + 208
37  MyApp                   0x1000ec948 0x1000e4000 + 35144
38  libdyld.dylib                   0x182fa959c start + 4


Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libsystem_kernel.dylib          0x00000001830b9014 __pthread_kill + 8
1   libsystem_pthread.dylib         0x0000000183183264 pthread_kill + 112
2   libsystem_c.dylib               0x000000018302d9c4 abort + 140
3   libc++abi.dylib                 0x0000000182af91b0 __cxa_bad_cast + 0
4   libc++abi.dylib                 0x0000000182b12c04 default_unexpected_handler() + 0
5   libobjc.A.dylib                 0x0000000182b20820 _objc_terminate() + 124
6   libc++abi.dylib                 0x0000000182b0f5d4 std::__terminate(void (*)()) + 16
7   libc++abi.dylib                 0x0000000182b0f640 std::terminate() + 60
8   libdispatch.dylib               0x0000000182f769b4 _dispatch_client_callout + 36
9   libdispatch.dylib               0x0000000182f776cc dispatch_once_f + 56
10  MyApp                   0x0000000100224e6c 0x1000e4000 + 1314412
11  MyApp                   0x00000001002214b4 0x1000e4000 + 1299636
12  MyApp                   0x00000001002213f0 0x1000e4000 + 1299440
13  MyApp                   0x0000000100222888 0x1000e4000 + 1304712
14  MyApp                   0x00000001002138b4 0x1000e4000 + 1243316
15  MyApp                   0x0000000100213020 0x1000e4000 + 1241120
16  MyApp                   0x0000000100212e60 0x1000e4000 + 1240672
17  MyApp                   0x00000001000ea83c 0x1000e4000 + 26684
18  MyApp                   0x00000001000eb2a4 0x1000e4000 + 29348
19  UIKit                           0x000000018a1e9b04 -[UIViewController loadViewIfRequired] + 1036
20  UIKit                           0x000000018a1e96e0 -[UIViewController view] + 28
21  UIKit                           0x000000018a1eff60 -[UIWindow addRootViewControllerViewIfPossible] + 76
22  UIKit                           0x000000018a1ed3fc -[UIWindow _setHidden:forced:] + 272
23  UIKit                           0x000000018a25ee68 -[UIWindow makeKeyAndVisible] + 48
24  UIKit                           0x000000018a467430 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 3632
25  UIKit                           0x000000018a46ce24 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1684
26  UIKit                           0x000000018a4818b0 __84-[UIApplication _handleApplicationActivationWithScene:transitionContext:completion:]_block_invoke.3147 + 48
27  UIKit                           0x000000018a46a0b8 -[UIApplication workspaceDidEndTransaction:] + 168
28  FrontBoardServices              0x0000000185c68884 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 36
29  FrontBoardServices              0x0000000185c686f0 -[FBSSerialQueue _performNext] + 176
30  FrontBoardServices              0x0000000185c68aa0 -[FBSSerialQueue _performNextFromRunLoopSource] + 56
31  CoreFoundation                  0x000000018406d42c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
32  CoreFoundation                  0x000000018406cd9c __CFRunLoopDoSources0 + 540
33  CoreFoundation                  0x000000018406a9a8 __CFRunLoopRun + 744
34  CoreFoundation                  0x0000000183f9ada4 CFRunLoopRunSpecific + 424
35  UIKit                           0x000000018a253fc8 -[UIApplication _run] + 652
36  UIKit                           0x000000018a24ec9c UIApplicationMain + 208
37  MyApp                   0x00000001000ec948 0x1000e4000 + 35144
38  libdyld.dylib                   0x0000000182fa959c start + 4