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Object didn't pass validation for format user-id: undefined when trying to list group members


When I try to list the members of a certain group I get this response:
“statusCode”: 400,
“error”: “Bad Request”,
“message”: “Object didn’t pass validation for format user-id: undefined”

The same message is being presented when I try to edit that group in the UI. Somehow that group has been corrupted and there seems no way back. Any suggestions besides deleting the group and creating it again? I have devices and data depending on group ids, you see…