Error message displayed when deleting API backends (despite it working)

If you navigate to an API Backend and then click the "Delete API" in the bottom, you'll get an error message of `Unexpected error deleting record: undefined` that pops up:

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However, the deletion actually did succeed (it's gone if you refresh the page or go back to the API Backends table), so this error message is confusing. So need to figure out why this message is popping up and ensure it only pops up in the case of an actual error.