Unreal Engine Issues and Bug Tracker (UE-90490)

Description

Importing two or more Textures into the Material Editor results in a crash. This is a regression from 4.24.3 (CL-11590370) as well.

This was reported and tested in 4.25 Preview 2 (CL-12055273) and reproduced in 4.26 (CL-12063615).

Steps to Reproduce

Open the UE4 Editor and create a Blank project
In the Content Browser create a Material and open it
Go back to the Content Browser and enable "Show Engine Content" then filter it for Textures
Grab any two Textures and drag them into the Material Editor

Results: The Editor crashes

Expected: The two Texture are imported into the Material Editor

Callstack

[2020.03.11-19.17.43:978][837]LogWindows: Windows GetLastError: The operation completed successfully. (0)
[2020.03.11-19.17.50:898][837]LogWindows: Error: === Critical error: ===
[2020.03.11-19.17.50:898][837]LogWindows: Error: 
[2020.03.11-19.17.50:898][837]LogWindows: Error: Assertion failed: TextureReferenceIndex != INDEX_NONE [File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/Engine/Private/Materials/HLSLMaterialTranslator.cpp] [Line: 4932] 
[2020.03.11-19.17.50:898][837]LogWindows: Error: Material expression called Compiler->Texture() without implementing UMaterialExpression::GetReferencedTexture properly
[2020.03.11-19.17.50:899][837]LogWindows: Error: 
[2020.03.11-19.17.50:899][837]LogWindows: Error: 
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff9d81c9159 KERNELBASE.dll!UnknownFunction []
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff96ba91106 UE4Editor-Core.dll!ReportAssert() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsPlatformCrashContext.cpp:1388]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff96ba94758 UE4Editor-Core.dll!FWindowsErrorOutputDevice::Serialize() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Windows\WindowsErrorOutputDevice.cpp:78]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff96b81f5bd UE4Editor-Core.dll!FOutputDevice::LogfImpl() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\OutputDevice.cpp:61]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff96b7ab145 UE4Editor-Core.dll!AssertFailedImplV() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:100]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff96b7ad560 UE4Editor-Core.dll!FDebug::CheckVerifyFailedImpl() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:450]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff95e9f31ac UE4Editor-Engine.dll!FHLSLMaterialTranslator::Texture() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Materials\HLSLMaterialTranslator.cpp:4932]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff95ea3bfad UE4Editor-Engine.dll!UMaterialExpressionTextureSample::Compile() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialExpressions.cpp:1773]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff959f7bd71 UE4Editor-MaterialEditor.dll!FMatExpressionPreview::CompilePropertyAndSetMaterialProperty() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\MaterialEditor\Private\MaterialEditor.cpp:212]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff95e9f70bb UE4Editor-Engine.dll!FHLSLMaterialTranslator::Translate() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Materials\HLSLMaterialTranslator.cpp:637]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff95eac2595 UE4Editor-Engine.dll!FMaterial::BeginCompileShaderMap() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialShared.cpp:1891]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff95eac43cb UE4Editor-Engine.dll!FMaterial::CacheShaders() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialShared.cpp:1822]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff95eac49d1 UE4Editor-Engine.dll!FMaterial::CacheShaders() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Engine\Private\Materials\MaterialShared.cpp:1687]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff959fbd775 UE4Editor-MaterialEditor.dll!FMaterialEditor::GetExpressionPreview() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\MaterialEditor\Private\MaterialEditor.cpp:4790]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff959feda90 UE4Editor-MaterialEditor.dll!FMaterialEditor::RefreshExpressionPreviews() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\MaterialEditor\Private\MaterialEditor.cpp:4726]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff959fb6092 UE4Editor-MaterialEditor.dll!FMaterialEditor::ForceRefreshExpressionPreviews() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\MaterialEditor\Private\MaterialEditor.cpp:3996]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff959fb60d7 UE4Editor-MaterialEditor.dll!FMaterialEditorUtilities::ForceRefreshExpressionPreviews() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\MaterialEditor\Private\MaterialEditorUtilities.cpp:68]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff95cf2bc58 UE4Editor-UnrealEd.dll!UMaterialGraphSchema::DroppedAssetsOnGraph() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\UnrealEd\Private\MaterialGraphSchema.cpp:748]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff959724568 UE4Editor-GraphEditor.dll!SGraphPanel::OnDrop() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Editor\GraphEditor\Private\SGraphPanel.cpp:998]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff96c61896f UE4Editor-Slate.dll!<lambda_e356e543718159020736727f05f9aa09>::operator()() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4730]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff96c5f20e5 UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_e356e543718159020736727f05f9aa09> >() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:372]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff96c683c87 UE4Editor-Slate.dll!FSlateApplication::RoutePointerUpEvent() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4726]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff96c66b751 UE4Editor-Slate.dll!FSlateApplication::ProcessMouseButtonUpEvent() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5198]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff96c65de52 UE4Editor-Slate.dll!FSlateApplication::OnMouseUp() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5166]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff9aede78e8 UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessDeferredMessage() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1963]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff9aedd5497 UE4Editor-ApplicationCore.dll!FWindowsApplication::DeferMessage() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2415]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff9aede9cbb UE4Editor-ApplicationCore.dll!FWindowsApplication::ProcessMessage() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1639]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff9aedd0f70 UE4Editor-ApplicationCore.dll!FWindowsApplication::AppWndProc() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:790]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff9da377446 USER32.dll!UnknownFunction []
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff9da376f62 USER32.dll!UnknownFunction []
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff9aedeb1d4 UE4Editor-ApplicationCore.dll!FWindowsPlatformApplicationMisc::PumpMessages() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff625d968c4 UE4Editor.exe!FEngineLoop::Tick() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4714]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff625dac05c UE4Editor.exe!GuardedMain() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff625dac13a UE4Editor.exe!GuardedMainWrapper() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff625dbe959 UE4Editor.exe!WinMain() [D:\Build\++UE4+Licensee\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:266]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff625dc1a3a UE4Editor.exe!__scrt_common_main_seh() [d:\agent\_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff9dbae7974 KERNEL32.DLL!UnknownFunction []
[2020.03.11-19.17.50:899][837]LogWindows: Error: [Callstack] 0x00007ff9dbd5a261 ntdll.dll!UnknownFunction []

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Fixed

Component	UE - Graphics Features
Affects Versions	4.25, 4.26
Target Fix	4.25

Fix Commit	12140400
Main Commit	12159935
Release Commit	12140400

Created	Mar 11, 2020
Resolved	Mar 13, 2020
Updated	Jul 30, 2020

UE-90490

Dragging more than one Texture into the Material Editor causes a crash

Dragging more than one Texture into the Material Editor causes a crash

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