I'm developing an iOS application in Swift. My WKWebview is crashing on iOS 13. I am using a web view inside a UIScrollView. Crashlyics showing me crash on WebCore -[WAKView addSubview:]. Here is my app crash report
Fatal Exception: NSInvalidArgumentException
0 CoreFoundation 0x19c91180c __exceptionPreprocess
1 libobjc.A.dylib 0x19c639fa4 objc_exception_throw
2 CoreFoundation 0x19c967350 -[__NSCFString characterAtIndex:].cold.1
3 CoreFoundation 0x19c968ba4 -[__NSSetM addObject:].cold.2
4 CoreFoundation 0x19c7edf60 -[__NSSetM addObject:]
5 WebCore 0x1a4433fc4 -[WAKView addSubview:]
6 WebKitLegacy 0x1a87dc6e4 -[WebFrameView(WebInternal) _setDocumentView:]
7 WebKitLegacy 0x1a88ad3d4 -[WebFrameView(WebInternal) _makeDocumentViewForDataSource:]
8 WebKitLegacy 0x1a88aa42c WebFrameLoaderClient::transitionToCommittedForNewPage()
9 WebCore 0x1a55da774 WebCore::FrameLoader::transitionToCommitted(WebCore::CachedPage*)
10 WebCore 0x1a55d9f10 WebCore::FrameLoader::commitProvisionalLoad()
11 WebCore 0x1a55b3d14 WebCore::DocumentLoader::finishedLoading()
12 WebCore 0x1a563a7c8 WebCore::CachedResource::checkNotify()
13 WebCore 0x1a5638784 WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*)
14 WebCore 0x1a560d7dc WebCore::SubresourceLoader::didFinishLoading(WebCore::NetworkLoadMetrics const&)
15 WebCore 0x1a5605ab0 WebCore::ResourceLoader::didFinishLoading(WebCore::ResourceHandle*)
16 WebCore 0x1a5dea6e0 ***::Detail::CallableWrapper<-[WebCoreResourceHandleAsOperationQueueDelegate connectionDidFinishLoading:]::$_7, void>::call()
17 JavaScriptCore 0x1ab5de6bc ***::dispatchFunctionsFromMainThread()
18 Foundation 0x19ccfa24c __NSThreadPerformPerform
19 CoreFoundation 0x19c88f7c4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
20 CoreFoundation 0x19c88f71c __CFRunLoopDoSource0
21 CoreFoundation 0x19c88eeb4 __CFRunLoopDoSources0
22 CoreFoundation 0x19c88a000 __CFRunLoopRun
23 CoreFoundation 0x19c8898a0 CFRunLoopRunSpecific
24 WebCore 0x1a4823b60 RunWebThread(void*)
25 libsystem_pthread.dylib 0x19c62e1d0 _pthread_start
26 libsystem_pthread.dylib 0x19c631ae0 thread_start