Crash when opening a sequence with an additive control rig track

The editor crashes when opening a sequence with an additive control rig track

1. Enable the control rig plugin
2. Add a skeletal mesh actor to a level
3. Create a new level sequence
4. Add the skeletal mesh actor to the sequence
5. Add an additive control rig track to the skeleton
6. Save the sequence
7. Close the editor
8. Reopen the editor
9. Open the sequence

RESULT:
The editor will crash

UE4Editor-ControlRig-Win64-Debug.dll!UAdditiveControlRig::Initialize(bool bInitRigUnits) Line 58 C++
UE4Editor-ControlRig-Win64-Debug.dll!UMovieSceneControlRigParameterTrack::PostLoad() Line 422 C++
UE4Editor-CoreUObject-Win64-Debug.dll!UObject::ConditionalPostLoad() Line 1067 C++
UE4Editor-CoreUObject-Win64-Debug.dll!EndLoad(FUObjectSerializeContext * LoadContext) Line 1612 C++
UE4Editor-CoreUObject-Win64-Debug.dll!LoadPackageInternal::__l71::<lambda>() Line 1231 C++
UE4Editor-CoreUObject-Win64-Debug.dll!LoadPackageInternal(UPackage * InOuter, const wchar_t * InLongPackageNameOrFilename, unsigned int LoadFlags, FLinkerLoad * ImportLinker, FArchive * InReaderOverride, FUObjectSerializeContext * InLoadContext) Line 1332 C++
UE4Editor-CoreUObject-Win64-Debug.dll!LoadPackage(UPackage * InOuter, const wchar_t * InLongPackageName, unsigned int LoadFlags, FArchive * InReaderOverride, FUObjectSerializeContext * InLoadContext) Line 1427 C++
UE4Editor-CoreUObject-Win64-Debug.dll!ResolveName(UObject * & InPackage, FString & InOutName, bool Create, bool Throw, unsigned int LoadFlags, FUObjectSerializeContext * InLoadContext) Line 767 C++
UE4Editor-CoreUObject-Win64-Debug.dll!StaticLoadObjectInternal(UClass * ObjectClass, UObject * InOuter, const wchar_t * InName, const wchar_t * Filename, unsigned int LoadFlags, UPackageMap * Sandbox, bool bAllowObjectReconciliation, FUObjectSerializeContext * InSerializeContext) Line 829 C++
UE4Editor-CoreUObject-Win64-Debug.dll!StaticLoadObject(UClass * ObjectClass, UObject * InOuter, const wchar_t * InName, const wchar_t * Filename, unsigned int LoadFlags, UPackageMap * Sandbox, bool bAllowObjectReconciliation, FUObjectSerializeContext * InSerializeContext) Line 904 C++
UE4Editor-CoreUObject-Win64-Debug.dll!FSoftObjectPath::TryLoad(FUObjectSerializeContext * InLoadContext) Line 431 C++
UE4Editor-LevelEditor-Win64-Debug.dll!FLevelEditorToolBar::OnCinematicsActorPicked(AActor * Actor) Line 2552 C++
UE4Editor-LevelEditor-Win64-Debug.dll!TBaseStaticDelegateInstance<void __cdecl(AActor *)>::ExecuteIfSafe(AActor * <Params_0>) Line 859 C++