export didn't work when Empty background

Export selected area as celldesigner in Empty background. then I changed background on Pathways and compartment, and I cannot reproduce error when Empty.

• url: https://pg-sandbox.uni.lu/minerva/api/projects/beta-2/models/168:downloadModel?backgroundOverlayId=256&handlerClass=lcsb.mapviewer.converter.model.celldesigner.CellDesignerXmlParser&polygonString=576.94,72.12;584.01,599.56;1090.24,603.80;1101.55,4.24;576.94,72.12;&zoomLevel=5&
• the error: {"reason":"Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1; nested exception is org.hibernate.StaleStateException: Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1","error":"Internal server error."}