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    Type:Bug Report 
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    Resolution: Fixed
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    Priority:L3 - Default 
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    Affects Version/s: None
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    Component/s: frontend
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    None
AT1:
Reproduce:
- Have a report that displays meaningful data (e.g. count process instance frequency grouped by start date by week visualized as pie chart)
- start by being in the report view mode and refresh the page
- enter edit mode
- make the report invalid (e.g. by selecting group by flow nodes)
- Cancel the changes
Expected:
- Original valid pie chart is displayed
Observed:
- Report is not displayed
AT2:
Reproduce:
- Have a report that displays meaningful data (e.g. count process instance frequency grouped by start date by week visualized as pie chart)
- start by being in the report view mode and refresh the page
- enter edit mode
- make the report invalid (e.g. by selecting group by flow nodes)
- select another chart from chart.js library (e.g. bar, line)
- Cancel the changes
Expected:
- Original valid pie chart is displayed
Observed:
- An error is thrown