Crash after updating project to 4.16 ( Ensure condition failed: InitializedIndexCount == NumRenderInstances )

having same issues

After updating our project to 4.16.
Package game crashes when trying to load a map (standalone works fine )
Same Project cooks fine in 4.7 to 4.15

Ensure condition failed: InitializedIndexCount == NumRenderInstances [File:D:\Build++UE4+Release-4.16+Compile\Sync\Engine\Source\Runtime\Engine\Private\HierarchicalInstancedStaticMesh.cpp] [Line: 2587]

Can anyone please help.