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Below are required details:Does it occur with some specific content (such as Javascript ) ?Is this content properly displayed in Safari ?>> App is using web content at multiple places, so not able to track down, majorly suspecting HomePage which is renders web content on WKWebview, and also have scripts to render Google ads in between pre-defined div containers.So we had tried with Google Video ads but were not able to replicate.Does it occur when you load video ? If so, see this:>> we have already tried with video contents in ads, but didn't faced any crash.https://answerstu.com/question-53659>> will check further on similar lines. Which version of XCode ?>> Xcode 10.1Additional Details: - One more observation crashes and users ratio is around 1:1 - Crash is not replicable, while getting crash reported for good number of users, seems its event or time driven vs just content loading.

Hi Team,Similar issue is obseved in one our application too, below is the stack trace of crashed thread:Note: 98% crashes were been observed on iOS 13 while 1% each on iOS 12 and 11 version.Crash stack trace:Fatal Exception: NSInvalidArgumentException 0 CoreFoundation 0x1c562898c __exceptionPreprocess 1 libobjc.A.dylib 0x1c53510a4 objc_exception_throw 2 CoreFoundation 0x1c567e3f8 -[__NSCFString characterAtIndex:].cold.1 3 CoreFoundation 0x1c567fc4c -[__NSSetM addObject:].cold.2 4 CoreFoundation 0x1c5505030 -[__NSSetM addObject:] 5 WebCore 0x1cd075f64 -[WAKView addSubview:] 6 WebKitLegacy 0x1d13d2794 -[WebFrameView(WebInternal) _setDocumentView:] 7 WebKitLegacy 0x1d14a3484 -[WebFrameView(WebInternal) _makeDocumentViewForDataSource:] 8 WebKitLegacy 0x1d14a04d8 WebFrameLoaderClient::transitionToCommittedForNewPage() 9 WebCore 0x1ce214ab0 WebCore::FrameLoader::transitionToCommitted(WebCore::CachedPage*) 10 WebCore 0x1ce21424c WebCore::FrameLoader::commitProvisionalLoad() 11 WebCore 0x1ce1ee2ac WebCore::DocumentLoader::finishedLoading() 12 WebCore 0x1ce2748f8 WebCore::CachedResource::checkNotify() 13 WebCore 0x1ce2728b4 WebCore::CachedRawResource::finishLoading(WebCore::SharedBuffer*) 14 WebCore 0x1ce24790c WebCore::SubresourceLoader::didFinishLoading(WebCore::NetworkLoadMetrics const&) 15 WebCore 0x1ce23fbe0 WebCore::ResourceLoader::didFinishLoading(WebCore::ResourceHandle*) 16 WebCore 0x1cea1c168 ***::Detail::CallableWrapper<-[WebCoreResourceHandleAsOperationQueueDelegate connectionDidFinishLoading:]::$_7, void>::call() 17 JavaScriptCore 0x1d419cbcc ***::dispatchFunctionsFromMainThread() 18 Foundation 0x1c5a11238 __NSThreadPerformPerform 19 CoreFoundation 0x1c55a67e0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ 20 CoreFoundation 0x1c55a6738 __CFRunLoopDoSource0 21 CoreFoundation 0x1c55a5ed0 __CFRunLoopDoSources0 22 CoreFoundation 0x1c55a101c __CFRunLoopRun 23 CoreFoundation 0x1c55a08bc CFRunLoopRunSpecific 24 WebCore 0x1cd45b100 RunWebThread(void*) 25 libsystem_pthread.dylib 0x1c53451ec _pthread_start 26 libsystem_pthread.dylib 0x1c5348aec thread_startNeed quick pointers on what all can be possibilities of crash.