Description

The editor crashes when pasting a comment box from a blueprint into a behavior tree.

Found in 4.12.1 binary. Reproduced in 4.11.2 binary and Main CL 3005971

Source Context

94       
   95       for (int32 iAux = 0; iAux < Node->Services.Num(); iAux++)
   96       {
   97       Node->Services[iAux]->ClearDebuggerState();
   98       }
   99       
  100       for (int32 iAux = 0; iAux < Node->Decorators.Num(); iAux++)
  101       {
  102       Node->Decorators[iAux]->ClearDebuggerState();
  103       }
  104       }
  105       
  106       // parent chain
  107       Node->ParentNode = NULL;
  108 ***** for (int32 iAux = 0; iAux < Node->Services.Num(); iAux++)
  109       {
  110       Node->Services[iAux]->ParentNode = Node;
  111       }
  112       
  113       for (int32 iAux = 0; iAux < Node->Decorators.Num(); iAux++)
  114       {
  115       Node->Decorators[iAux]->ParentNode = Node;
  116       }
  117       
  118       // prepare node instance
  119       UBTNode* NodeInstance = Cast<UBTNode>(Node->NodeInstance);
  120       if (NodeInstance)
  121       {
  122       // mark all nodes as disconnected first, path from root will replace it with valid values later
  123       NodeInstance->InitializeNode(NULL, MAX_uint16, 0, 0);
Steps to Reproduce

1. Open the editor
2. Create a new actor blueprint
3. Create a new behavior tree
4. In the actor blueprint, press C to add a comment box
5. Select the comment box and copy it (CTRL+C)
6. Open the behavior tree
7. Add a Sequence and a MoveTo node
8. Select the MoveTo node
9. CTRL+V to paste the comment box

Result: Editor Crashes

Callstack
UE4Editor_BehaviorTreeEditor!UBehaviorTreeGraph::UpdateAsset() behaviortreegraph.cpp:109 
UE4Editor_AIGraph!FAIGraphEditor::PasteNodesHere() aigrapheditor.cpp:447 
UE4Editor_AIGraph!FAIGraphEditor::PasteNodes() aigrapheditor.cpp:303 
UE4Editor_AIGraph!TBaseRawMethodDelegateInstance<0,FAIGraphEditor,void __cdecl() delegateinstancesimpl_variadics.inl:642 
UE4Editor_Slate!FUICommandList::ConditionalProcessCommandBindings() uicommandlist.cpp:206 
UE4Editor_Slate!FUICommandList::ProcessCommandBindings() uicommandlist.cpp:150 
UE4Editor_GraphEditor!SGraphEditorImpl::OnKeyDown() sgrapheditorimpl.cpp:66 
UE4Editor_Slate!<lambda_7c66138389984533974223608bc6375f>::operator() slateapplication.cpp:4232 
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FKeyEvent,<lambda_7c66138389984533974223608bc6375f> >() slateapplication.cpp:215 
UE4Editor_Slate!FEventRouter::RouteAlongFocusPath<FEventRouter::FBubblePolicy,<lambda_7c66138389984533974223608bc6375f>,FKeyEvent>() slateapplication.cpp:197 
UE4Editor_Slate!FSlateApplication::ProcessKeyDownEvent() slateapplication.cpp:4230 
UE4Editor_Slate!FSlateApplication::OnKeyDown() slateapplication.cpp:4147 
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() windowsapplication.cpp:1342 
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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Fixed
ComponentGameplay - AI
Affects Versions4.114.124.13
Target Fix4.13
Fix Commit2981079
Main Commit3016298
CreatedJun 8, 2016
ResolvedJun 9, 2016
UpdatedMay 2, 2018