Unexpected error while deleting Transformer

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1

Whenever I try Deleting an Entity Transformer I get an Unexpected Error.
Via the UI:

deletepopup
deletepopup755×687 32.4 KB

Unexpected error
Unexpected error1142×227 17.6 KB

Via the Alumiu API:
…/api/v1/di/configurations/list-transformer/{id}
HTTP/1.1 500 Internal Server Error
Any ideas as to what might be causing this?