This is a common crash that has occurred in 4.17.1 and 4.17.2, there are no immediate records of it occurring previously. Users have not provided any descriptions of their actions when the crash occurred.
Source Context
367 uint8* FObjectPropertyNode::GetValueBaseAddress( uint8* StartAddress )
368 {
369 uint8* Result = StartAddress;
370
371 UClass* ClassObject;
372 ***** if ( (ClassObject=Cast<UClass>((UObject*)Result)) != NULL )
373 {
374 Result = (uint8*)ClassObject->GetDefaultObject();
375 }
376
377 return Result;
378 }
Access violation - code c0000005 (first/second chance not available) UE4Editor_PropertyEditor!FObjectPropertyNode::GetValueBaseAddress() [objectpropertynode.cpp:373] UE4Editor_PropertyEditor!FItemPropertyNode::GetValueBaseAddress() [itempropertynode.cpp:39] UE4Editor_PropertyEditor!FValueCache::GetPropertyValueAddresses() [propertychangelistener.cpp:196] UE4Editor_PropertyEditor!FValueCache::ScanForChanges() [propertychangelistener.cpp:116] UE4Editor_PropertyEditor!FPropertyChangeListener::ScanForChanges() [propertychangelistener.cpp:230] UE4Editor_Sequencer!FSequencerObjectChangeListener::OnObjectPostEditChange() [sequencerobjectchangelistener.cpp:381] UE4Editor_Sequencer!TBaseRawMethodDelegateInstance<0,FSequencerObjectChangeListener,void __cdecl() [delegateinstancesimpl.h:648] UE4Editor_CoreUObject!TBaseMulticastDelegate<void,UObject * __ptr64,FPropertyChangedEvent & __ptr64>::Broadcast() [delegatesignatureimpl.inl:937] UE4Editor_Engine!AActor::PostEditChangeProperty() [actoreditor.cpp:137] UE4Editor_CoreUObject!UObject::PostEditChange() [obj.cpp:333] UE4Editor_UnrealEd!FBlueprintEditorUtils::PostEditChangeBlueprintActors() [blueprinteditorutils.cpp:7632] UE4Editor_Kismet!FBlueprintEditor::OnBlueprintChangedImpl() [blueprinteditor.cpp:3189] UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327] UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl() [delegateinstancesimpl.h:434] UE4Editor_Engine!TBaseMulticastDelegate<void,UBlueprint * __ptr64>::Broadcast() [delegatesignatureimpl.inl:937] UE4Editor_Kismet!FBlueprintCompilationManagerImpl::CompileSynchronouslyImpl() [blueprintcompilationmanager.cpp:206] UE4Editor_UnrealEd!FKismetEditorUtilities::CompileBlueprint() [kismet2.cpp:750] UE4Editor_Kismet!FBlueprintEditor::Compile() [blueprinteditor.cpp:3291] UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl() [delegateinstancesimpl.h:327] UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl() [delegateinstancesimpl.h:434] UE4Editor_Slate!FUICommandList::ExecuteAction() [uicommandlist.cpp:97] UE4Editor_Slate!SToolBarButtonBlock::OnClicked() [stoolbarbuttonblock.cpp:305] UE4Editor_Slate!TMemberFunctionCaller<SToolBarButtonBlock,FReply() [delegateinstanceinterface.h:165] UE4Editor_Slate!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<TMemberFunctionCaller<SToolBarButtonBlock,FReply() [tuple.h:497] UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl() [delegateinstancesimpl.h:327] UE4Editor_Slate!TBaseDelegate<FReply>::Execute() [delegatesignatureimpl.inl:537] UE4Editor_Slate!SButton::OnMouseButtonUp() [sbutton.cpp:282] UE4Editor_Slate!<lambda_1002768c627006711ef2f351a87ec0e7>::operator() [slateapplication.cpp:5199] UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_1002768c627006711ef2f351a87ec0e7> >() [slateapplication.cpp:232] UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [slateapplication.cpp:5188] UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [slateapplication.cpp:5690] UE4Editor_Slate!FSlateApplication::OnMouseUp() [slateapplication.cpp:5670] UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1718] UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2161] UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:881] UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:721] user32!UserCallWinProcCheckWow() user32!DispatchMessageWorker() UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:1009] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3151] UE4Editor!GuardedMain() [launch.cpp:166] UE4Editor!GuardedMainWrapper() [launchwindows.cpp:134] UE4Editor!WinMain() [launchwindows.cpp:210] UE4Editor!__scrt_common_main_seh() [exe_common.inl:253] kernel32!BaseThreadInitThunk() ntdll!RtlUserThreadStart()
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-50831 in the post.