The important step here is to unlink the middle layer after first relinking everything.
Alternately, see attached project for repro. Open M_MyLayeredMaterial_inst and delete "Layer 1", then relink the layers, unlink Layer 1, then delete Layer 1 again to observe the crash.
UE4Editor_Core!AssertFailedImplV() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:102] UE4Editor_Core!FDebug::CheckVerifyFailedImpl() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:458] UE4Editor_Engine!DispatchCheckVerify<void,<lambda_ff57ed05420f90fd4f0e60c56e6b73eb> >() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Misc\AssertionMacros.h:165] UE4Editor_Engine!UMaterialInstance::UpdateParameters() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialInstance.cpp:511] UE4Editor_Engine!UMaterialInstance::UpdateParameterNames() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialInstance.cpp:4059] UE4Editor_UnrealEd!UMaterialEditorInstanceConstant::RegenerateArrays() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\PreviewMaterial.cpp:975] UE4Editor_UnrealEd!UMaterialEditorInstanceConstant::PostEditChangeProperty() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\PreviewMaterial.cpp:877] UE4Editor_CoreUObject!UObject::PostEditChangeChainProperty() [D:\Build\++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Obj.cpp:454] UE4Editor_PropertyEditor!FPropertyNode::NotifyPostChange() [D:\Build\++UE4\Sync\Engine\Source\Editor\PropertyEditor\Private\PropertyNode.cpp:2342] UE4Editor_PropertyEditor!FPropertyHandleBase::NotifyPostChange() [D:\Build\++UE4\Sync\Engine\Source\Editor\PropertyEditor\Private\PropertyHandleImpl.cpp:3015] UE4Editor_MaterialEditor!SMaterialLayersFunctionsInstanceTree::RemoveLayer() [D:\Build\++UE4\Sync\Engine\Source\Editor\MaterialEditor\Private\SMaterialLayersFunctionsTree.cpp:1213] UE4Editor_MaterialEditor!TBaseSPMethodDelegateInstance<0,SMaterialLayersFunctionsInstanceTree,0,void __cdecl(void),FDefaultDelegateUserPolicy,int>::ExecuteIfSafe() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:307] UE4Editor_PropertyEditor!PropertyCustomizationHelpers::SPropertyEditorButton::OnClick() [D:\Build\++UE4\Sync\Engine\Source\Editor\PropertyEditor\Private\PropertyCustomizationHelpers.cpp:86] UE4Editor_PropertyEditor!TBaseSPMethodDelegateInstance<0,PropertyCustomizationHelpers::SPropertyEditorButton,0,FReply __cdecl(void),FDefaultDelegateUserPolicy>::Execute() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290] UE4Editor_Slate!SButton::ExecuteOnClick() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:385] UE4Editor_Slate!SButton::OnMouseButtonUp() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:304] UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_cc5aea9e7377b04ce85c30c65ec3889b> >() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:378] UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4815] UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5356] UE4Editor_Slate!FSlateApplication::OnMouseUp() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5321] UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2174] UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2638] UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1042] UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:874] user32 user32 UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [D:\Build\++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130] UE4Editor!FEngineLoop::Tick() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4746] UE4Editor!GuardedMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169] UE4Editor!GuardedMainWrapper() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137] UE4Editor!WinMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268] UE4Editor!__scrt_common_main_seh() [d:\agent\_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288] kernel32 ntdll
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-108012 in the post.
2 |
Component | UE - Graphics Features |
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Affects Versions | 4.26 |
Target Fix | 4.27 |
Created | Feb 5, 2021 |
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Resolved | Apr 26, 2021 |
Updated | Nov 30, 2022 |