Unreal Engine Issues and Bug Tracker (UE-104438)

Description

More ways to reproduce:

In Chaos Cache Collection Editor press Add Element button (no matter when you will do this step)
If in Step13 from Steps to reproduce you won't place Chaos Cache Collection Editor as tab of Main Editor window ** (remain it as separate window instead of it) crash will be appear ** with pressing start PIE button

More info:

No crash if Chaos Cache Collection Editor is closed when record goes
No such crash if I remove element from Chaos Cache Collection using Remove all button before trying to press Add Element button (I can add as much elements as I removed. On next element cash will appear). Can be seen in AfterRemoveAll.gif
Crash still exists if I remove elements one by one from Chaos Cache Collection before trying to press Add Element button. Can be seen in AfterRemoveOneByOne.gif
No matter how Chaos Cache collection was created (it can be also created from Content Browser but behavior will be same for it)

Platforms:

Was checked only for Windows

Regression:

Can't be checked in 4.23 because of no Chaos Cache Collection in it (Caching has had a ground-up rewrite after 4.23)
Can be reproduced in 4.26 - Chaos

Steps to Reproduce

Open any project
Ensure that ChaosCaching plugin is enabled
Place Cube static mesh in the world above the floor
Switch to Fracture mode
Create Geometry Collection from Cube (click on New button -> select folder -> click Create Geometry Collection)
Switch to Select mode
Right click on Cube -> Select Caching -> Create Cache Manager
Select created Chaos Cache Manager (you can find it in World Outliner)
In Details panel click on dropdown near Cache Collection
Select Chaos Cache Collection (in Create New Asset section)
Press Save button
In Content Browser double click on created Chaos Cache Collection asset
Place opened Chaos Cache Collection Editor as tab of Main Editor window
Switch to Main Editor tab
In Details panel click on Record button
Start PIE
Wait a little and stop PIE
Switch to Chaos Cache Collection Editor tab

Actual result:

Crash! (Steps from 7 to 18 can be seen in steps.gif)

Expected result:

Chaos Cache Collection Editor tab is opened
New element with created record is added

Callstack

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\4.27\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 703] Array index out of bounds: 0 from an array of size 0

UnrealEditor_Core!AssertFailedImplV() [AssertionMacros.cpp:131]
UnrealEditor_Core!FDebug::CheckVerifyFailedImpl() [AssertionMacros.cpp:494]
UnrealEditor_ChaosCachingEditor!DispatchCheckVerify<void,<lambda_85fcc26e576ed73b4d4ecfa6e675069e> >() [AssertionMacros.h:179]
UnrealEditor_ChaosCachingEditor!FCacheCollectionDetails::GenerateCacheArrayElementWidget() [CacheCollectionCustomization.cpp:161]
UnrealEditor_ChaosCachingEditor!TBaseSPMethodDelegateInstance<0,FCacheCollectionDetails,0,void __cdecl(TSharedRef<IPropertyHandle,0>,int,IDetailChildrenBuilder &) [DelegateInstancesImpl.h:290]
UnrealEditor_ChaosCachingEditor!FDetailArrayBuilder::GenerateChildContent() [PropertyCustomizationHelpers.h:493]
UnrealEditor_PropertyEditor!FDetailCustomBuilderRow::OnGenerateChildren() [DetailCustomBuilderRow.cpp:67]
UnrealEditor_PropertyEditor!FDetailItemNode::GenerateChildren() [DetailItemNode.cpp:397]
UnrealEditor_PropertyEditor!TBaseSPMethodDelegateInstance<0,FDetailItemNode,0,void __cdecl(void) [DelegateInstancesImpl.h:307]
UnrealEditor_ChaosCachingEditor!TBaseRawMethodDelegateInstance<0,FDetailArrayBuilder,void __cdecl(void) [DelegateInstancesImpl.h:469]
UnrealEditor_PropertyEditor!FPropertyNode::EnsureDataIsValid() [PropertyNode.cpp:613]
UnrealEditor_PropertyEditor!FPropertyNode::EnsureDataIsValid() [PropertyNode.cpp:664]
UnrealEditor_PropertyEditor!FPropertyNode::EnsureDataIsValid() [PropertyNode.cpp:664]
UnrealEditor_PropertyEditor!SDetailsViewBase::Tick() [SDetailsViewBase.cpp:888]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1351]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [SCompoundWidget.cpp:37]
UnrealEditor_Slate!SBorder::OnPaint() [SBorder.cpp:120]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SOverlay::OnPaint() [SOverlay.cpp:95]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [SCompoundWidget.cpp:37]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [SPanel.cpp:31]
UnrealEditor_Slate!SSplitter::OnPaint() [SSplitter.cpp:169]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SOverlay::OnPaint() [SOverlay.cpp:95]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [SCompoundWidget.cpp:37]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [SCompoundWidget.cpp:37]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [SCompoundWidget.cpp:37]
UnrealEditor_Slate!SBorder::OnPaint() [SBorder.cpp:120]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SOverlay::OnPaint() [SOverlay.cpp:95]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [SCompoundWidget.cpp:37]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [SPanel.cpp:31]
UnrealEditor_Slate!SSplitter::OnPaint() [SSplitter.cpp:169]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SOverlay::OnPaint() [SOverlay.cpp:95]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [SCompoundWidget.cpp:37]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SPanel::PaintArrangedChildren() [SPanel.cpp:31]
UnrealEditor_SlateCore!SPanel::OnPaint() [SPanel.cpp:12]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SOverlay::OnPaint() [SOverlay.cpp:95]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SCompoundWidget::OnPaint() [SCompoundWidget.cpp:37]
UnrealEditor_SlateCore!SWidget::Paint() [SWidget.cpp:1456]
UnrealEditor_SlateCore!SWindow::PaintSlowPath() [SWindow.cpp:2069]
UnrealEditor_SlateCore!FSlateInvalidationRoot::PaintInvalidationRoot() [SlateInvalidationRoot.cpp:262]
UnrealEditor_SlateCore!SWindow::PaintWindow() [SWindow.cpp:2101]
UnrealEditor_Slate!FSlateApplication::DrawWindowAndChildren() [SlateApplication.cpp:1067]
UnrealEditor_Slate!FSlateApplication::PrivateDrawWindows() [SlateApplication.cpp:1290]
UnrealEditor_Slate!FSlateApplication::DrawWindows() [SlateApplication.cpp:1028]
UnrealEditor_Slate!FSlateApplication::TickAndDrawWidgets() [SlateApplication.cpp:1580]
UnrealEditor_Slate!FSlateApplication::Tick() [SlateApplication.cpp:1434]
UnrealEditor!FEngineLoop::Tick() [LaunchEngineLoop.cpp:5115]
UnrealEditor!GuardedMain() [Launch.cpp:171]
UnrealEditor!GuardedMainWrapper() [LaunchWindows.cpp:137]
UnrealEditor!WinMain() [LaunchWindows.cpp:268]
UnrealEditor!__scrt_common_main_seh() [exe_common.inl:288]

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Cannot Reproduce

Component	UE - Simulation - Physics - Destruction
Affects Versions	4.26-chaos, 5.0-m4
Target Fix	5.1

Created	Dec 11, 2020
Resolved	Apr 28, 2022
Updated	Apr 28, 2022

View Jira Issue

UE-104438

Crash on adding new element to ChaosCacheCollection if ChaosCacheCollection is open in editor

Crash on adding new element to ChaosCacheCollection if ChaosCacheCollection is open in editor

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