Since the release of iOS 13 we are getting crash reports from Itunes Connect saying UIKitCore: -[UIResponder doesNotRecognizeSelector:].Can anyone help me understand the following crash report?The crash seems to happen only at launch.Following https://developer.apple.com/library/archive/technotes/tn2151/_index.html -[NSObject(NSObject) doesNotRecognizeSelector:] occurs when a new object is allocated in the memory previously occupied by the deallocated object. Profiling the app with the Zombies instrument doesn't really help, I just can't reproduce the situation.Please understand that I had to **** out the actual app name.Incident Identifier: E2E4860B-2714-4CB8-9499-6228F48FC206 CrashReporter Key: 87ee941f267b3bff9e4bde9c5977b1d1fc7f0d35 Hardware Model: iPhone10,4 Process: *********** [16655] Path: /private/var/containers/Bundle/Application/45BB2B04-9950-4E2A-B63A-7328C23E33C3/***********.app/*********** Identifier: de.*************.mobile.connect Version: 1 (1.0.8) AppStoreTools: 11A1002b AppVariant: 1:iPhone10,4:13 Code Type: ARM-64 (Native) Role: Non UI Parent Process: launchd [1] Coalition: de.**************.mobile.connect [2654] Date/Time: 2019-10-15 12:51:56.5319 +0200 Launch Time: 2019-10-15 12:47:09.2979 +0200 OS Version: iPhone OS 13.1.2 (17A860) Release Type: User Baseband Version: 3.01.01 Report Version: 104 Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Exception Note: EXC_CORPSE_NOTIFY Triggered by Thread: 0 Last Exception Backtrace: 0 CoreFoundation 0x1ae45498c __exceptionPreprocess + 220 (NSException.m:199) 1 libobjc.A.dylib 0x1ae17d0a4 objc_exception_throw + 56 (objc-exception.mm:565) 2 CoreFoundation 0x1ae35843c -[NSObject(NSObject) doesNotRecognizeSelector:] + 140 (NSObject.m:144) 3 UIKitCore 0x1b24902a8 -[UIResponder doesNotRecognizeSelector:] + 296 (UIResponder.m:659) 4 CoreFoundation 0x1ae458e08 ___forwarding___ + 1324 (NSForwarding.m:3325) 5 CoreFoundation 0x1ae45abec _CF_forwarding_prep_0 + 92 6 UIKitCore 0x1b2353040 -[UIUndoGestureInteraction didMoveToView:] + 108 (UIUndoGestureInteraction.m:725) 7 UIKitCore 0x1b28eb3c4 _setInteractionView + 84 (UIView.m:16421) 8 UIKitCore 0x1b28eb2a0 -[UIView(Dragging) addInteraction:] + 268 (UIView.m:16450) 9 UIKitCore 0x1b26cd2b8 -[UIEditingOverlayViewController _addInteractions] + 260 (UIEditingOverlayViewController.m:79) 10 UIKitCore 0x1b1e5b2ec -[UIViewController _setViewAppearState:isAnimating:] + 832 (UIViewController.m:4695) 11 UIKitCore 0x1b1e5b6fc __52-[UIViewController _setViewAppearState:isAnimating:]_block_invoke + 268 (UIViewController.m:4758) 12 CoreFoundation 0x1ae42773c __NSARRAY_IS_CALLING_OUT_TO_A_BLOCK__ + 16 (NSArrayHelpers.m:9) 13 CoreFoundation 0x1ae32b86c -[__NSArrayI enumerateObjectsWithOptions:usingBlock:] + 152 (NSArrayI.m:108) 14 UIKitCore 0x1b1e5b49c -[UIViewController _setViewAppearState:isAnimating:] + 1264 (UIViewController.m:4736) 15 UIKitCore 0x1b1e5d530 __64-[UIViewController viewDidMoveToWindow:shouldAppearOrDisappear:]_block_invoke + 44 (UIViewController.m:5272) 16 UIKitCore 0x1b1e5c32c -[UIViewController _executeAfterAppearanceBlock] + 88 (UIViewController.m:5050) 17 UIKitCore 0x1b246bca4 _runAfterCACommitDeferredBlocks + 584 (UIApplication.m:3027) 18 UIKitCore 0x1b245b7c0 _cleanUpAfterCAFlushAndRunDeferredBlocks + 232 (UIApplication.m:2986) 19 UIKitCore 0x1b248b594 _afterCACommitHandler + 76 (UIApplication.m:3048) 20 CoreFoundation 0x1ae3d1c48 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32 (CFRunLoop.c:1758) 21 CoreFoundation 0x1ae3ccb34 __CFRunLoopDoObservers + 416 (CFRunLoop.c:1868) 22 CoreFoundation 0x1ae3cd100 __CFRunLoopRun + 1308 (CFRunLoop.c:2910) 23 CoreFoundation 0x1ae3cc8bc CFRunLoopRunSpecific + 464 (CFRunLoop.c:3192) 24 GraphicsServices 0x1b8238328 GSEventRunModal + 104 (GSEvent.c:2246) 25 UIKitCore 0x1b24626d4 UIApplicationMain + 1936 (UIApplication.m:4753) 26 *********** 0x104684a60 main + 68 (APIInfoUser.swift:7) 27 libdyld.dylib 0x1ae257460 start + 4 Thread 0 name: Thread 0 Crashed: 0 libsystem_kernel.dylib 0x00000001ae24cebc __pthread_kill + 8 1 libsystem_pthread.dylib 0x00000001ae16cc1c pthread_kill$VARIANT$armv81 + 192 (pthread.c:1456) 2 libsystem_c.dylib 0x00000001ae0bc824 abort + 100 (abort.c:110) 3 libc++abi.dylib 0x00000001ae2157d4 abort_message + 128 (abort_message.cpp:76) 4 libc++abi.dylib 0x00000001ae2159c4 demangling_terminate_handler() + 296 (cxa_default_handlers.cpp:66) 5 libobjc.A.dylib 0x00000001ae17d358 _objc_terminate() + 124 (objc-exception.mm:701) 6 libc++abi.dylib 0x00000001ae222304 std::__terminate(void (*)()) + 16 (cxa_handlers.cpp:59) 7 libc++abi.dylib 0x00000001ae221ed8 __cxa_rethrow + 144 (cxa_exception.cpp:618) 8 libobjc.A.dylib 0x00000001ae17d258 objc_exception_rethrow + 40 (objc-exception.mm:604) 9 CoreFoundation 0x00000001ae3cc92c CFRunLoopRunSpecific + 576 (CFRunLoop.c:3206) 10 GraphicsServices 0x00000001b8238328 GSEventRunModal + 104 (GSEvent.c:2246) 11 UIKitCore 0x00000001b24626d4 UIApplicationMain + 1936 (UIApplication.m:4753) 12 *********** 0x0000000104684a60 main + 68 (APIInfoUser.swift:7) 13 libdyld.dylib 0x00000001ae257460 start + 4 Thread 1: 0 libsystem_pthread.dylib 0x00000001ae174ad8 start_wqthread + 0 Thread 2: 0 libsystem_pthread.dylib 0x00000001ae174ad8 start_wqthread + 0 Thread 3 name: Thread 3: 0 libdyld.dylib 0x00000001ae260188 DyldSharedCache::inCache(void const*, unsigned long, bool&) const + 44 (DyldSharedCache.cpp:243) 1 libdyld.dylib 0x00000001ae262e8c dyld3::AllImages::immutableMemory(void const*, unsigned long) const + 56 (AllImages.cpp:784) 2 libdispatch.dylib 0x00000001ae121578 _dispatch_strdup_if_mutable + 40 (init.c:1372) 3 libdispatch.dylib 0x00000001ae0fe5f8 _dispatch_lane_create_with_target + 328 (queue.c:2740) 4 CFNetwork 0x00000001b1757c44 Tube* Tube::createNewTube5 CFNetwork 0x00000001b17244bc TubeManager::_onqueue_enqueueRequestForProtocol(MetaConnectionCacheClient*, HTTPRequestMessage co... + 656 (TubeManager.cpp:461) 6 CFNetwork 0x00000001b168fc00 GlueTubeManager::enqueueRequestForProtocol(MetaConnectionCacheClient*, HTTPRequestMessage const*,... + 428 (TubeManager.cpp:168) 7 CFNetwork 0x00000001b166bb48 invocation function for block in XTubeManager::enqueueRequestForProtocol(MetaConnectionCacheClien... + 48 (LocalSession.mm:228) 8 CFNetwork 0x00000001b166bae0 XTubeManager::withTubeManager(CoreSchedulingSet const*, void (GlueTubeManager*) block_pointer) + 248 (LocalSession.mm:279) 9 CFNetwork 0x00000001b164ac80 -[__NSURLSessionLocal _withConnectionCache_enqueueRequest:forProtocol:scheduling:options:] + 128 (LocalSession.mm:227) 10 CFNetwork 0x00000001b1770850 HTTPProtocol::asynchronouslyCreateAndOpenStream_WithMessage_AfterCookiesAndAuthenticatorHeaders(_... + 3440 (HTTPProtocol.cpp:2990) 11 CFNetwork 0x00000001b176f838 HTTPProtocol::asynchronouslyAddAuthenticatorHeadersAndContinue(__CFHTTPMessage*) + 108 (HTTPProtocol.cpp:2793) 12 CFNetwork 0x00000001b177214c invocation function for block in HTTPProtocol::asynchronouslyAddCookiesAndContinue(__CFHTTPMessage*) + 28 (HTTPProtocol.cpp:3434) 13 CFNetwork 0x00000001b185f534 invocation function for block in QCoreSchedulingSet::performAsync(void () block_pointer) const + 52 (CoreSchedulingSet.mm:190) 14 libdispatch.dylib 0x00000001ae121610 _dispatch_call_block_and_release + 24 (init.c:1408) 15 libdispatch.dylib 0x00000001ae122184 _dispatch_client_callout + 16 (object.m:495) 16 libdispatch.dylib 0x00000001ae0ff73c _dispatch_lane_serial_drain$VARIANT$armv81 + 564 (inline_internal.h:2487) 17 libdispatch.dylib 0x00000001ae100188 _dispatch_lane_invoke$VARIANT$armv81 + 452 (queue.c:3820) 18 libdispatch.dylib 0x00000001ae1012a8 _dispatch_workloop_invoke$VARIANT$armv81 + 1736 (inline_internal.h:2528) 19 libdispatch.dylib 0x00000001ae10943c _dispatch_workloop_worker_thread + 576 (queue.c:6386) 20 libsystem_pthread.dylib 0x00000001ae171fa4 _pthread_wqthread + 276 (pthread.c:2323) 21 libsystem_pthread.dylib 0x00000001ae174ae0 start_wqthread + 8 Thread 4 name: Thread 4: 0 libsystem_kernel.dylib 0x00000001ae22b5f4 mach_msg_trap + 8 1 libsystem_kernel.dylib 0x00000001ae22aa60 mach_msg + 72 (mach_msg.c:103) 2 CoreFoundation 0x00000001ae3d2068 __CFRunLoopServiceMachPort + 216 (CFRunLoop.c:2575) 3 CoreFoundation 0x00000001ae3cd188 __CFRunLoopRun + 1444 (CFRunLoop.c:2931) 4 CoreFoundation 0x00000001ae3cc8bc CFRunLoopRunSpecific + 464 (CFRunLoop.c:3192) 5 Foundation 0x00000001ae70c994 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 228 (NSRunLoop.m:374) 6 Foundation 0x00000001ae70c874 -[NSRunLoop(NSRunLoop) runUntilDate:] + 88 (NSRunLoop.m:421) 7 UIKitCore 0x00000001b24fa49c -[UIEventFetcher threadMain] + 152 (UIEventFetcher.m:637) 8 Foundation 0x00000001ae83d0b0 __NSThread__start__ + 848 (NSThread.m:724) 9 libsystem_pthread.dylib 0x00000001ae1711ec _pthread_start + 124 (pthread.c:895) 10 libsystem_pthread.dylib 0x00000001ae174aec thread_start + 8 Thread 5: 0 libsystem_pthread.dylib 0x00000001ae174ad8 start_wqthread + 0 Thread 6: 0 libsystem_pthread.dylib 0x00000001ae174ad8 start_wqthread + 0 Thread 7: 0 libsystem_pthread.dylib 0x00000001ae174ad8 start_wqthread + 0 Thread 0 crashed with ARM Thread State (64-bit): x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x0000000000000000 x4: 0x00000001ae2255d8 x5: 0x000000016b77f430 x6: 0x000000000000006e x7: 0x0000000000000700 x8: 0x0000000104bb1800 x9: 0x00000001ae16cb5c x10: 0x00000001ae168720 x11: 0x000000000000000b x12: 0x00000001e57af080 x13: 0x0000000000000030 x14: 0x0000000000000010 x15: 0x0000000000000000 x16: 0x0000000000000148 x17: 0x0000000000000001 x18: 0x0000000000000000 x19: 0x0000000000000006 x20: 0x0000000000000407 x21: 0x0000000104bb18e0 x22: 0x0000000282594270 x23: 0x00000001eafdb5e0 x24: 0x0000000281c9c0d0 x25: 0x0000000000000000 x26: 0x0000000000000001 x27: 0x00000001047e4160 x28: 0x000000016b77faf0 fp: 0x000000016b77f390 lr: 0x00000001ae16cc1c sp: 0x000000016b77f370 pc: 0x00000001ae24cebc cpsr: 0x40000000 esr: 0x56000080 Address size fault