Reproduce:

• Create a process report and select an visualization without colors (e.g. table or number)
• Create a combined report and Include the process report in it
• go back to the process report and change the view and visualization to something different than before (for example bar)
• when pressing save, a conflict modal appears
• when clicking 'save', sometimes you get a response of 500 with the following error message:

  {
    "errorMessage" : "Elasticsearch exception [type=script_exception, reason=runtime error]",
    "reportDefinition" : null
  }
  

• when clicking the button again it saves the report, but it does not remove it from the combined report which causes it to crash when opened