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The sequencer engine crashes as soon as I turn it on

There is a sequencer file in it, the whole engine will crash whenever I open it, this thing has been done for me for a month, and now the automatic backup is also broken, can anyone help me

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Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000000000000a8

UE4Editor_MovieSceneTracks!<lambda_e02627d7615f1f7945b8e7c1a7be97b8>::operator()() [D:\Build++UE4\Sync\Engine\Source\Runtime\MovieSceneTracks\Private\Tracks\MovieSceneSkeletalAnimationTrack.cpp:236]
UE4Editor_MovieSceneTracks!AlgoImpl::IntroSortInternal<UMovieSceneSection *,int,FIdentityFunctor,TDereferenceWrapper<UMovieSceneSection *,<lambda_e02627d7615f1f7945b8e7c1a7be97b8> > >() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Algo\IntroSort.h:63]
UE4Editor_MovieSceneTracks!UMovieSceneSkeletalAnimationTrack::SetUpRootMotions() [D:\Build++UE4\Sync\Engine\Source\Runtime\MovieSceneTracks\Private\Tracks\MovieSceneSkeletalAnimationTrack.cpp:465]
UE4Editor_MovieScene!UMovieSceneTrack::PostLoad() [D:\Build++UE4\Sync\Engine\Source\Runtime\MovieScene\Private\MovieSceneTrack.cpp:65]
UE4Editor_MovieSceneTracks!UMovieSceneSkeletalAnimationTrack::PostLoad() [D:\Build++UE4\Sync\Engine\Source\Runtime\MovieSceneTracks\Private\Tracks\MovieSceneSkeletalAnimationTrack.cpp:93]
UE4Editor_CoreUObject!UObject::ConditionalPostLoad() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Obj.cpp:1082]
UE4Editor_CoreUObject!EndLoad() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:1628]
UE4Editor_CoreUObject!<lambda_94537a9bd809517493790f80316e3165>::operator()() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:1257]
UE4Editor_CoreUObject!LoadPackageInternal() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:1363]
UE4Editor_CoreUObject!LoadPackage() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:1458]
UE4Editor_CoreUObject!ResolveName() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:787]
UE4Editor_CoreUObject!StaticLoadObjectInternal() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:849]
UE4Editor_CoreUObject!StaticLoadObject() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:924]
UE4Editor_ContentBrowserAssetDataSource!ContentBrowserAssetData::EditOrPreviewAssetFileItems() [D:\Build++UE4\Sync\Engine\Plugins\Editor\ContentBrowser\ContentBrowserAssetDataSource\Source\ContentBrowserAssetDataSource\Private\ContentBrowserAssetDataCore.cpp:276]
UE4Editor_ContentBrowserAssetDataSource!ContentBrowserAssetData::EditOrPreviewItems() [D:\Build++UE4\Sync\Engine\Plugins\Editor\ContentBrowser\ContentBrowserAssetDataSource\Source\ContentBrowserAssetDataSource\Private\ContentBrowserAssetDataCore.cpp:307]
UE4Editor_ContentBrowserAssetDataSource!UContentBrowserAssetDataSource::BulkEditItems() [D:\Build++UE4\Sync\Engine\Plugins\Editor\ContentBrowser\ContentBrowserAssetDataSource\Source\ContentBrowserAssetDataSource\Private\ContentBrowserAssetDataSource.cpp:932]
UE4Editor_ContentBrowser!SContentBrowser::OnItemsActivated() [D:\Build++UE4\Sync\Engine\Source\Editor\ContentBrowser\Private\SContentBrowser.cpp:2238]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SContentBrowser,0,void __cdecl(TArrayView<FContentBrowserItem const ,int>,enum EAssetTypeActivationMethod::Type),FDefaultDelegateUserPolicy>::Execute() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290]
UE4Editor_ContentBrowser!SAssetView::OnListMouseButtonDoubleClick() [D:\Build++UE4\Sync\Engine\Source\Editor\ContentBrowser\Private\SAssetView.cpp:3446]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SAssetView,0,void __cdecl(TSharedPtr<FAssetViewItem,0>),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:307]
UE4Editor_ContentBrowser!TDelegate<void __cdecl(TSharedPtr<FAssetViewItem,0>),FDefaultDelegateUserPolicy>::ExecuteIfBound<void,0>() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateSignatureImpl.inl:599]
UE4Editor_ContentBrowser!SListView<TSharedPtr<FAssetViewItem,0> >::Private_OnItemDoubleClicked() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Public\Widgets\Views\SListView.h:1074]
UE4Editor_ContentBrowser!STableRow<TSharedPtr<FAssetViewItem,0> >::OnMouseButtonDoubleClick() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Public\Widgets\Views\STableRow.h:458]
UE4Editor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,<lambda_2b5148752c2a272000c47b69ff14a42e> >() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:378]
UE4Editor_Slate!FSlateApplication::RoutePointerDoubleClickEvent() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5281]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonDoubleClickEvent() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5268]
UE4Editor_Slate!FSlateApplication::OnMouseDoubleClick() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5231]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2178]
UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2638]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1042]
UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:874]
user32
user32
UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130]
UE4Editor!FEngineLoop::Tick() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4746]
UE4Editor!GuardedMain() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169]
UE4Editor!GuardedMainWrapper() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
UE4Editor!WinMain() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
UE4Editor!__scrt_common_main_seh() [d:\agent_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

Thanks for the report. This is a bug in that there are some empty animation sections in your sequence. Normally they are removed on load, but with the root motion changes we added for 4.26, there’s a bug preventing from being removed. I’ve fixed the issue but unfortunately it won’t be coming out with the 4.26.1 hotfix. It’ll be available in the next hotfix.

For tracking purposes, here’s the issue (it’s not public yet, but will be soon): Unreal Engine Issues and Bug Tracker (UE-106948)