Steps to Reproduce

• Create a Flow Node Count report
• Grouped by Flow Node
• Visualized as Heatmap
• Select configuration Flow Node Status 'Cancelled or interrupted'

Problem

• No Data to Display message appears, even if cancelled or interrupted instances exists
• Configuration button is disabled

Hint
Browser console shows the following exception

Tried to parse error object, but failed 
Response { type: "basic", url: "http://localhost:8090/api/report/evaluate/?", redirected: false, status: 400, ok: false, statusText: "Bad Request", headers: Headers, body: ReadableStream, bodyUsed: true }