Crash when using ComplexCollisionMesh and the ComplexCollisionMesh has more material index than drawing mesh's material index

void FBodyInstance::GetComplexPhysicalMaterials(const FBodyInstance*, TWeakObjectPtr<UPrimitiveComponent> OwnerComp, TArray<UPhysicalMaterial*>& OutPhysicalMaterials)
{
if(!GEngine || !GEngine->DefaultPhysMaterial)
{
UE_LOG(LogPhysics, Error, TEXT("FBodyInstance::GetComplexPhysicalMaterials : GEngine not initialized! Cannot call this during native CDO construction, wrap with if(!HasAnyFlags(RF_ClassDefaultObject)) or move out of constructor, material parameters will not be correct."));

return;
}

// See if the Material has a PhysicalMaterial
UPrimitiveComponent* PrimComp = OwnerComp.Get();
if (PrimComp)
{
UStaticMeshComponent* StatComp = Cast<UStaticMeshComponent>(PrimComp);
if(StatComp && StatComp->GetStaticMesh() && StatComp->GetStaticMesh()->ComplexCollisionMesh)
{
UStaticMesh* Mesh = StatComp->GetStaticMesh()->ComplexCollisionMesh;

const int32 NumMaterials = Mesh->StaticMaterials.Num();
OutPhysicalMaterials.SetNum(NumMaterials);

for (int32 MatIdx = 0; MatIdx < NumMaterials; MatIdx++)
{
UPhysicalMaterial* PhysMat = GEngine->DefaultPhysMaterial;
UMaterialInterface* Material = Mesh->GetMaterial(MatIdx);
if (Material)
{
PhysMat = Material->GetPhysicalMaterial();
}

check(PhysMat != NULL);
OutPhysicalMaterials[MatIdx] = PhysMat;
}
}
else
{
const int32 NumMaterials = PrimComp->GetNumMaterials();
OutPhysicalMaterials.SetNum(NumMaterials);

for (int32 MatIdx = 0; MatIdx < NumMaterials; MatIdx++)
{
UPhysicalMaterial* PhysMat = GEngine->DefaultPhysMaterial;
UMaterialInterface* Material = PrimComp->GetMaterial(MatIdx);
if (Material)
{
PhysMat = Material->GetPhysicalMaterial();
}

check(PhysMat != NULL);
OutPhysicalMaterials[MatIdx] = PhysMat;
}
}
}
}