Unreal Engine Issues and Bug Tracker (UE-73000)

Description

A crash occurs after adding an additional camera track, undoing the additional, and then calling garbage collection

Appears to be the same callstack found here [Link Removed]

Steps to Reproduce

Download the attached project
Open the project
Open "NewLevelSequence"
Add a track to "Camera Anim"
Select the Camera Anim "NewCameraAnim"
Undo (ctrl+z was used for this test)
Press the '~' key to bring up the console
Use the command "obj gc" (without quotes)

Results: The engine will crash
Expected: The track would be removed and then garbage collection would be run

Callstack

Unhandled exception

UE4Editor_MovieScene!UMovieSceneTrack::GetMaxRowIndex() [d:\build\++ue4\sync\engine\source\runtime\moviescene\private\moviescenetrack.cpp:251]
UE4Editor_Sequencer!FSequencerTrackNode::GetNodeHeight() [d:\build\++ue4\sync\engine\source\editor\sequencer\private\displaynodes\sequencertracknode.cpp:488]
UE4Editor_Sequencer!UE4Function_Private::TFunctionRefCaller<<lambda_65325ce9a71d25064562921fffd68bf6>,FOptionalSize __cdecl(void)>::Call() [d:\build\++ue4\sync\engine\source\runtime\core\public\templates\function.h:478]
UE4Editor_Sequencer!TBaseFunctorDelegateInstance<FOptionalSize __cdecl(void),TFunction<FOptionalSize __cdecl(void)> >::Execute() [d:\build\++ue4\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:894]
UE4Editor_Slate!SBox::ComputeDesiredSize() [d:\build\++ue4\sync\engine\source\runtime\slate\private\widgets\layout\sbox.cpp:156]
UE4Editor_SlateCore!SWidget::CacheDesiredSize() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:621]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:520]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_SlateCore!SWidget::SlatePrepass() [d:\build\++ue4\sync\engine\source\runtime\slatecore\private\widgets\swidget.cpp:512]
UE4Editor_Slate!PrepassWindowAndChildren() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1427]
UE4Editor_Slate!FSlateApplication::DrawPrepass() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1473]
UE4Editor_Slate!FSlateApplication::PrivateDrawWindows() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1520]
UE4Editor_Slate!FSlateApplication::DrawWindows() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1246]
UE4Editor_Slate!FSlateApplication::TickApplication() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1848]
UE4Editor_Slate!FSlateApplication::Tick() [d:\build\++ue4\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:1679]
UE4Editor!FEngineLoop::Tick() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:4071]
UE4Editor!GuardedMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\launch.cpp:168]
UE4Editor!GuardedMainWrapper() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:145]
UE4Editor!WinMain() [d:\build\++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:275]
UE4Editor!__scrt_common_main_seh() [d:\agent\_work\3\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

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Fixed

Component	UE - Anim - Sequencer
Affects Versions	4.22, 4.20.3, 4.23, 4.21.2
Target Fix	4.22.1

Fix Commit	6014456
Main Commit	6014458

Created	Apr 18, 2019
Resolved	Apr 19, 2019
Updated	May 13, 2019

UE-73000

Crash after Undo and garbage collection on sequencer track

Crash after Undo and garbage collection on sequencer track

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