Having an actor blueprint (A) that contains an array variable of references to another actor (B) that is connected to a Length node and a Vector array that is connected to a ForEachLoop causes blueprint B to crash on compile.
Source Context:
557 else
558 {
559 for (auto NodeIt = AllNodes.CreateIterator(); NodeIt; ++NodeIt)
560 {
561 UK2Node* Node = *NodeIt;
562 TArray<UStruct*> Dependencies;
563 if (Node->HasExternalDependencies(&Dependencies))
564 {
565 for (UStruct* Struct : Dependencies)
566 {
567 bool bShouldRefresh = Struct->IsChildOf(RefreshOnlyChild);
568 if (!bShouldRefresh)
569 {
570 UClass* OwnerClass = Struct->GetOwnerClass();
571 ***** if (ensureMsgf(!OwnerClass->GetClass()->IsChildOf<UBlueprintGeneratedClass>() || OwnerClass->ClassGeneratedBy
572 , TEXT("Malformed Blueprint class (%s) - bad node dependency, unable to determine if the %s node (%s) should be refreshed or not. Currently compiling: %s")
573 , *OwnerClass->GetName()
574 , *Node->GetClass()->GetName()
575 , *Node->GetPathName()
576 , *Blueprint->GetName()) )
577 {
578 bShouldRefresh |= OwnerClass &&
579 (OwnerClass->IsChildOf(RefreshOnlyChild) || OwnerClass->GetAuthoritativeClass()->IsChildOf(RefreshOnlyChild));
580 }
581 }
582 if (bShouldRefresh)
583 {
584 //@todo: Do we really need per-schema refreshing?
585 const UEdGraphSchema* Schema = Node->GetGraph()->GetSchema();
586 Schema->ReconstructNode(*Node, true);
Logs:
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Found in 4.12.1.
This is a regression. Could not reproduce in 4.11.2 binary.
A second Answerhub post is also reporting this same crash: https://answers.unrealengine.com/questions/432367/4121-crash-compiling-character-blueprints.html
1. Open the editor
2. Create two actor blueprints (A & B)
3. Open A
4. Add an array variable of type B reference
5. Add a vector array variable
6. Get both variables in the event graph
7. Off of the B reference array, add a Length node
8. Off of the vector array, add a ForEachLoop node
9. Compile
10. Open B
11. Compile B
Result: Editor Crashes
UE4Editor_UnrealEd!FBlueprintEditorUtils::RefreshExternalBlueprintDependencyNodes() blueprinteditorutils.cpp:572 UE4Editor_KismetCompiler!FKismetCompilerContext::Compile() kismetcompiler.cpp:3627 UE4Editor_KismetCompiler!FKismet2CompilerModule::CompileBlueprintInner() kismetcompilermodule.cpp:100 UE4Editor_KismetCompiler!FKismet2CompilerModule::CompileBlueprint() kismetcompilermodule.cpp:203 UE4Editor_UnrealEd!FKismetEditorUtilities::CompileBlueprint() kismet2.cpp:756 UE4Editor_Kismet!FBlueprintEditor::Compile() blueprinteditor.cpp:3184 UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,TTypeWrapper<void> __cdecl() delegateinstancesimpl_variadics.inl:321 UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FBlueprintEditor,0,void __cdecl() delegateinstancesimpl_variadics.inl:427 UE4Editor_Slate!FUICommandList::ExecuteAction() uicommandlist.cpp:87 UE4Editor_Slate!SToolBarButtonBlock::OnClicked() stoolbarbuttonblock.cpp:300 UE4Editor_Slate!TMemberFunctionCaller<SToolBarButtonBlock,FReply() delegateinstanceinterface_variadics.h:161 UE4Editor_Slate!TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter_ExplicitReturnType<FReply,TMemberFunctionCaller<SToolBarButtonBlock,FRep tuple.h:128 UE4Editor_Slate!TBaseSPMethodDelegateInstance<0,SToolBarButtonBlock,0,FReply __cdecl() delegateinstancesimpl_variadics.inl:321 UE4Editor_Slate!TBaseDelegate<FReply>::Execute() delegatesignatureimpl_variadics.inl:521 UE4Editor_Slate!SButton::OnMouseButtonUp() sbutton.cpp:275 UE4Editor_Slate!<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1>::operator() slateapplication.cpp:4598 UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FToLeafmostPolicy,FPointerEvent,<lambda_8d0e9a1da76abd0a756a3a9d775f5ed1> >() slateapplication.cpp:215 UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() slateapplication.cpp:4587 UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() slateapplication.cpp:5041 UE4Editor_Slate!FSlateApplication::OnMouseUp() slateapplication.cpp:5021 UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() windowsapplication.cpp:1507 UE4Editor_Core!FWindowsApplication::DeferMessage() windowsapplication.cpp:1847 UE4Editor_Core!FWindowsApplication::ProcessMessage() windowsapplication.cpp:742 UE4Editor_Core!FWindowsApplication::AppWndProc() windowsapplication.cpp:664 user32!<Unknown> user32!<Unknown> UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() windowsplatformmisc.cpp:903 UE4Editor!FEngineLoop::Tick() launchengineloop.cpp:2728 UE4Editor!GuardedMain() launch.cpp:148 UE4Editor!GuardedMainWrapper() launchwindows.cpp:126 UE4Editor!WinMain() launchwindows.cpp:200 UE4Editor!__scrt_common_main_seh() exe_common.inl:264 kernel32!<Unknown> ntdll!<Unknown>
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| 0 |
| Component | UE - Gameplay - Blueprint |
|---|---|
| Affects Versions | 4.12.1 |
| Target Fix | 4.12.2 |
| Fix Commit | 3004529 |
|---|
| Created | Jun 7, 2016 |
|---|---|
| Resolved | Jun 7, 2016 |
| Updated | Apr 27, 2018 |