Crash when removing cloth apb's assigned to asset

When removing already assigned cloth asset from a skeletal mesh it will crash the editor. I was able to reproduce this with the Owen asset from Content Examples, but was unable to get it to work from a newly created asset.

This behavior did not happen in 4.10.4 with the same asset, but in 4.11, 4.12, and 4.13 this happens when removing the Cloth Coat APB from the material element.

I've attached a sample project with the Owen Character in 4.11 that reproduces the crash as you remove the APB.

Test Project link: [Link Removed]

1. Open the test project
2. Open the Owen Skeletal mesh
3. Set the cloth apb assigned (Owen_Cloth_MESH_Owen_Coat.apb) to Material Element 0 to "None"

Regression: Yes

Frequency: 3/3

Results: Editor will crash

Expected: Cloth asset can be unassigned from the material element.

UE4Editor_Core!FDebug::AssertFailed() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\private\misc\outputdevice.cpp:430]
UE4Editor_Engine!TGPUSkinAPEXClothVertexFactoryShaderParameters::SetMesh() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\engine\private\gpuskinvertexfactory.cpp:746]
UE4Editor_Renderer!FMeshMaterialShader::SetMesh<FRHIVertexShader * __ptr64>() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\renderer\private\shaderbaseclasses.cpp:467]
UE4Editor_Renderer!TBasePassVertexShaderPolicyParamType<FUniformLightMapPolicyShaderParametersType>::SetMesh() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\renderer\private\basepassrendering.inl:16]
UE4Editor_Renderer!TBasePassDrawingPolicy<FUniformLightMapPolicy>::SetMeshRenderState() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\renderer\private\basepassrendering.h:909]
UE4Editor_Renderer!FDrawBasePassDynamicMeshAction::Process<FUniformLightMapPolicy>() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\renderer\private\basepassrendering.cpp:421]
UE4Editor_Renderer!ProcessBasePassMesh<FDrawBasePassDynamicMeshAction>() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\renderer\private\basepassrendering.h:1242]
UE4Editor_Renderer!FBasePassOpaqueDrawingPolicyFactory::DrawDynamicMesh() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\renderer\private\basepassrendering.cpp:472]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderBasePassDynamicData() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:426]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderBasePass() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:1875]
UE4Editor_Renderer!FDeferredShadingSceneRenderer::Render() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\renderer\private\deferredshadingrenderer.cpp:1060]
UE4Editor_Renderer!RenderViewFamily_RenderThread() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\renderer\private\scenerendering.cpp:1744]
UE4Editor_Renderer!TGraphTask<`FRendererModule::BeginRenderingViewFamily'::`20'::EURCMacro_FDrawSceneCommand>::ExecuteTask() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\public\async\taskgraphinterfaces.h:886]
UE4Editor_Core!FNamedTaskThread::ProcessTasksNamedThread() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\private\async\taskgraph.cpp:779]
UE4Editor_Core!FNamedTaskThread::ProcessTasksUntilQuit() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\private\async\taskgraph.cpp:526]
UE4Editor_RenderCore!RenderingThreadMain() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\rendercore\private\renderingthread.cpp:310]
UE4Editor_RenderCore!FRenderingThread::Run() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\rendercore\private\renderingthread.cpp:417]
UE4Editor_Core!FRunnableThreadWin::Run() [d:\buildfarm\buildmachine_++ue4+release-4.11\engine\source\runtime\core\private\windows\

"Session Disconnected" UEFN

Fix UE-51650

I am not able to find world outliner how to enable it?

Delay nodes occasionally don't fire the "Completed" output in a nativized build

Undefined sysmbol: typeinfo for AActor when cross-compile linux dedicated server on windows

How does Character rotate in the current position in the blueprint?

Bonjour j'ai un petit problème c'est que je ne vois plus l'onglet "scability" pour changer les graphismes de uefn et j'ai pas trouvé l'option pour le faire revenir ?

Error EU-FA-31003 when trying to download the new preview

An error occurred while trying to generate project files !?

Installer 4.10 failed with error code R-1603