Using a user generated timeline in blueprint causes an exception in engine code.

This crash is caused by an exception that is thrown due to the functions inside of a blueprint based off a user-defined class that is suppose to mimic Timelines.

1. Download the attached project
2. After unzipping the project, right click the .uproject file and select 'Generate Visual Studio Project Files'
3. After that completes, run the .sln file to open the project in Visual Studio
4. Build the solution (ctrl+shift+b)
5. Return to the file explorer and run the .uproject file
6. If it is not already loaded, load the 'Untitled' map from the content browser
7. Run the game in PIE
8. Observe that numbers are being printed at the top left every frame
9. Wait for ~1 minute and the crash should occur

Access violation - code c0000005 (first/second chance not available)

""

UE4Editor_Engine!UCurveBase::GetTimeRange() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\curvebase.cpp:844]
UE4Editor_Engine!FTimeline::GetLastKeyframeTime() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\timeline.cpp:529]
UE4Editor_Engine!FTimeline::GetTimelineLength() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\timeline.cpp:463]
UE4Editor_Engine!FTimeline::TickTimeline() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\timeline.cpp:366]
UE4Editor_CrashAngelArts
UE4Editor_Engine!FTimerUnifiedDelegate::Execute() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\public\timermanager.h:38]
UE4Editor_Engine!FTimerManager::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\timermanager.cpp:538]
UE4Editor_Engine!UWorld::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\leveltick.cpp:1223]
UE4Editor_UnrealEd!UEditorEngine::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\editorengine.cpp:1339]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\unrealedengine.cpp:366]
UE4Editor!FEngineLoop::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\launchengineloop.cpp:2355]
UE4Editor!GuardedMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\windows\launchwindows.cpp:295]

Fix UE-51650

i have this problem UE4CC-Windows-58DC12AF4B97F057BD108FBFF569B2E9_0000

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