Crash when setting Anim to "None" with URO

A Crash can occur when setting a skeletal mesh's animation instance to None when it has Update Rate Optimizations enabled.

An unverified proposed fix for this is to remove the nullptr check when setting bInvalidCachedCurve within RefreshBoneTransforms.

Enable Update Rate Optimizations on a skeletal mesh with an animation BP

Play

Set the skeletal mesh's anim instance to None

Reproduction is unreliable

FBaseBlendedCurve<FDefaultAllocator>::GetValidElementCount(const TArray<unsigned short,FDefaultAllocator> * InUIDToArrayIndexLUT) Line 385 C++
FBaseBlendedCurve<FDefaultAllocator>::CopyFrom(const FBaseBlendedCurve<FDefaultAllocator> & CurveToCopyFrom) Line 580 C++
USkeletalMeshComponent::RefreshBoneTransforms(FActorComponentTickFunction * TickFunction) Line 2120 C++
USkinnedMeshComponent::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction * ThisTickFunction) Line 796 C++
USkeletalMeshComponent::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction * ThisTickFunction) Line 1247 C++

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