What are the steps to reproduce your problem?
Optimize 2.2 (also in stage):
1. Create a Report "View Frequency of Process Instances", "Group by start Date Week", "Visualize as Area Chart". Save Report
2. Create combined report, add the new report to it, save combined report.
3. Delete Area Chart Report.
What is the problem?
The report is deleted, but I see an exception in the UI.
See attached screenshot.
This does not always happen, but sometimes. Hard to reproduce.
What would be the expected behavior:
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