[0.12.0.1] Fatal Error No Window "Material Istance Dynamic"

Was trying to find the summer character on my second fly-around (wasn’t showing up).

https://mega.nz/folder/vlIQQDbb#tDqHhC9wuaXq3iBe8KJ7EQ

LowLevelFatalError [File:Unknown] [Line: 826]
Rendering thread exception:
LowLevelFatalError [File:Unknown] [Line: 258]
FMeshElementCollector::AddMesh - On MeshBatchElement 0, Material ‘MaterialInstanceDynamic_5’, index buffer object has null RHI resource