Deleting a module in diagram editor crashes the diagram editor for the specific model

Diagram editor for the model cannot be opened again, even if you restart the program or try to export and re-import the model.

WARN  [2019-06-20 08:24:27,052] org.simantics.diagram.adapter.TypeGroup: Most likely after deleting a diagram or something therefore no ordered set can be found for [id=$778252]
WARN  [2019-06-20 08:24:27,052] org.simantics.diagram.adapter.TypeGroup: Most likely after deleting a diagram or something therefore no ordered set can be found for [id=$778252]
WARN  [2019-06-20 08:24:27,066] org.simantics.diagram.adapter.DiagramContentRequest: Most likely diagram is being removed and therefore ordered list can not be found for [id=$778252]