Unreal Engine Issues and Bug Tracker (UE-193848)

Description

The first time that a Behavior Tree editor window changes from the tree to the Blackboard can cause a crash if you add and remove a key from the Blackboard via a different Behavior Tree editor window. If you open the blackboard view on both trees prior to adding and removing the key, the editor does not crash and works as is expected. The blackboard view can become stale if you add and remove keys from the other behavior tree editor tab, but it does not cause a crash of the editor.

Steps to Reproduce

Create new Blackboard
Create 2 Behavior Trees and set their Blackboard to the one created in step 1
Add keys to the Blackboard
1. Not sure of the amount of keys needed, but will not repro if only a few keys exist
2. Here is a copy of the keys used to originally repro: [Image Removed]
Close and re-open the editor
Open the two BTs but careful not to open the blackboard view on them
In one BT, switch to the BB view
Add a Bool key
Remove the Bool key
Switch to the other BT
Try to open the BB view

Expected Result: The Blackboard view opens as normal.

Actual Result: The editor hangs then crashes inside of GetPaletteItemIcon.

Callstack

UnrealEditor_BehaviorTreeEditor!SBehaviorTreeBlackboardItem::GetPaletteItemIcon() [E:\UE_5.3\Engine\Source\Editor\BehaviorTreeEditor\Private\SBehaviorTreeBlackboardView.cpp:173]
UnrealEditor_BehaviorTreeEditor!SBehaviorTreeBlackboardItem::Construct() [E:\UE_5.3\Engine\Source\Editor\BehaviorTreeEditor\Private\SBehaviorTreeBlackboardView.cpp:129]
UnrealEditor_BehaviorTreeEditor!TSlateDecl<SBehaviorTreeBlackboardItem,RequiredArgs::T1RequiredArgs<FCreateWidgetForActionData * const &> >::operator<<=() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Public\Widgets\DeclarativeSyntaxSupport.h:976]
UnrealEditor_BehaviorTreeEditor!SBehaviorTreeBlackboardView::HandleCreateWidgetForAction() [E:\UE_5.3\Engine\Source\Editor\BehaviorTreeEditor\Private\SBehaviorTreeBlackboardView.cpp:540]
UnrealEditor_BehaviorTreeEditor!TBaseSPMethodDelegateInstance<0,SBehaviorTreeBlackboardView,1,TSharedRef<SWidget,1> __cdecl(FCreateWidgetForActionData *),FDefaultDelegateUserPolicy>::Execute() [E:\UE_5.3\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:281]
UnrealEditor_GraphEditor!SGraphActionMenu::MakeWidget() [E:\UE_5.3\Engine\Source\Editor\GraphEditor\Private\SGraphActionMenu.cpp:920]
UnrealEditor_GraphEditor!TBaseSPMethodDelegateInstance<0,SGraphActionMenu,1,TSharedRef<ITableRow,1> __cdecl(TSharedPtr<FGraphActionNode,1>,TSharedRef<STableViewBase,1> const &),FDefaultDelegateUserPolicy,bool>::Execute() [E:\UE_5.3\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:281]
UnrealEditor_GraphEditor!STreeView<TSharedPtr<FGraphActionNode,1> >::GenerateNewWidget() [E:\UE_5.3\Engine\Source\Runtime\Slate\Public\Widgets\Views\STreeView.h:825]
UnrealEditor_GraphEditor!SListView<TSharedPtr<FGraphActionNode,1> >::GenerateWidgetForItem() [E:\UE_5.3\Engine\Source\Runtime\Slate\Public\Widgets\Views\SListView.h:1496]
UnrealEditor_GraphEditor!SListView<TSharedPtr<FGraphActionNode,1> >::ReGenerateItems() [E:\UE_5.3\Engine\Source\Runtime\Slate\Public\Widgets\Views\SListView.h:1396]
UnrealEditor_GraphEditor!STreeView<TSharedPtr<FGraphActionNode,1> >::ReGenerateItems() [E:\UE_5.3\Engine\Source\Runtime\Slate\Public\Widgets\Views\STreeView.h:1030]
UnrealEditor_Slate!STableViewBase::Tick() [E:\UE_5.3\Engine\Source\Runtime\Slate\Private\Widgets\Views\STableViewBase.cpp:308]
UnrealEditor_GraphEditor!STreeView<TSharedPtr<FGraphActionNode,1> >::Tick() [E:\UE_5.3\Engine\Source\Runtime\Slate\Public\Widgets\Views\STreeView.h:620]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1458]
UnrealEditor_SlateCore!SOverlay::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SOverlay.cpp:207]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:46]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:46]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:46]
UnrealEditor_Slate!SBorder::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\Slate\Private\Widgets\Layout\SBorder.cpp:129]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:46]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:46]
UnrealEditor_Slate!SBorder::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\Slate\Private\Widgets\Layout\SBorder.cpp:129]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SOverlay::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SOverlay.cpp:207]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:46]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:31]
UnrealEditor_Slate!SSplitter::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\Slate\Private\Widgets\Layout\SSplitter.cpp:253]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SOverlay::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SOverlay.cpp:207]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SOverlay::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SOverlay.cpp:207]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:46]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:46]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:46]
UnrealEditor_Slate!SBorder::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\Slate\Private\Widgets\Layout\SBorder.cpp:129]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SOverlay::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SOverlay.cpp:207]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:46]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:31]
UnrealEditor_Slate!SSplitter::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\Slate\Private\Widgets\Layout\SSplitter.cpp:253]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SOverlay::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SOverlay.cpp:207]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SOverlay::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SOverlay.cpp:207]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:46]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SOverlay::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SOverlay.cpp:207]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SCompoundWidget.cpp:46]
UnrealEditor_SlateCore!SWidget::Paint() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWidget.cpp:1573]
UnrealEditor_SlateCore!SWindow::PaintSlowPath() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWindow.cpp:2075]
UnrealEditor_SlateCore!FSlateInvalidationRoot::PaintInvalidationRoot() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\FastUpdate\SlateInvalidationRoot.cpp:405]
UnrealEditor_SlateCore!SWindow::PaintWindow() [E:\UE_5.3\Engine\Source\Runtime\SlateCore\Private\Widgets\SWindow.cpp:2109]
UnrealEditor_Slate!FSlateApplication::DrawWindowAndChildren() [E:\UE_5.3\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:1154]
UnrealEditor_Slate!FSlateApplication::PrivateDrawWindows() [E:\UE_5.3\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:1390]
UnrealEditor_Slate!FSlateApplication::DrawWindows() [E:\UE_5.3\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:1098]
UnrealEditor_Slate!FSlateApplication::TickAndDrawWidgets() [E:\UE_5.3\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:1684]
UnrealEditor_Slate!FSlateApplication::Tick() [E:\UE_5.3\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:1540]
UnrealEditor!FEngineLoop::Tick() [E:\UE_5.3\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5951]
UnrealEditor!GuardedMain() [E:\UE_5.3\Engine\Source\Runtime\Launch\Private\Launch.cpp:188]
UnrealEditor!GuardedMainWrapper() [E:\UE_5.3\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:118]
UnrealEditor!LaunchWindowsStartup() [E:\UE_5.3\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:258]
UnrealEditor!WinMain() [E:\UE_5.3\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:298]
UnrealEditor!__scrt_common_main_seh() [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

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Fixed

Component	UE - AI - BehaviorTree
Affects Versions	5.2.1, 5.3
Target Fix	5.4

Fix Commit	27420438
Main Commit	27420500

Created	Aug 24, 2023
Resolved	Aug 29, 2023
Updated	Aug 30, 2023

View Jira Issue

UE-193848

[AI] BehaviorTreeEditor crash when swapping from Behavior Tree to Blackboard view.

[AI] BehaviorTreeEditor crash when swapping from Behavior Tree to Blackboard view.

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