Issue Summary

Adding more than one value, or adding an additional one when a group picker (multiple groups) in a bulk operation will result in an internal server error:

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Steps to Reproduce

See the recording: Bulk edit internal server error.mp4

• Have a custom field of type Group picker (Multiple groups)
• Start a bulk operation on two or more issues
  • Check to edit a group picker (multiple groups) field, selecting two values
• Click on Next

Expected Results

The operation will proceed and the field will be edited.

Actual Results

You get an error 500 after clicking on Next.

Workaround

If you need to bulk update a big number of issues, a CSV import might be helpful: Bulk edit issues with CSV import.mp4