This is a trending crash coming out of the 4.18 Preview. Users have not provided any descriptions of their actions when the crash occurred.
At the moment it is divided among a few different crashGroups with slight variation in callstacks.
repro steps currently unknown
Access violation - code c0000005 (first/second chance not available) UE4Editor_Engine!FDebugCanvasDrawer::InitDebugCanvas() [debugcanvas.cpp:158] UE4Editor_Engine!FSceneViewport::EnqueueBeginRenderFrame() [sceneviewport.cpp:1506] UE4Editor_Engine!FViewport::Draw() [unrealclient.cpp:1182] UE4Editor_UnrealEd!UEditorEngine::UpdateSingleViewportClient() [editorengine.cpp:2046] UE4Editor_UnrealEd!UEditorEngine::Tick() [editorengine.cpp:1791] UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [unrealedengine.cpp:396] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3295] 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()
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-50196 in the post.