Unhandled error in the console when multiple existing configuration IDs are returned

This shouldn't happen but apparently it can happen anyway and first of all there's a L missing in Multiple, but most importantly than error isn't handled by the frontend and breaks the configuration modal a little

[Vue warn]: Error in 1: "Error: Mutiple existing configuration IDs returned."

This happened when trying to create this configuration

for the worker Transcription to Parent Copier (Classic), in Arkindex prod.