Middleware deprovisioning API error

[phavekes]

When deleting a non-existing user using the middleware deprovisioning API,

curl -X "DELETE" -u lifecycle:password -H 'Accept: application/json' "https://middleware/deprovision/urn:collab:person:org.nl:unknown-user" -s

the error returned is

{"errors":["TypeError: Argument 1 passed to Surfnet\\StepupMiddleware\\CommandHandlingBundle\\SensitiveData\\SensitiveData::withRecoveryTokenSecret() must implement interface Surfnet\\Stepup\\Identity\\Value\\RecoveryTokenIdentifier, null given, called in \/var\/www\/html\/src\/Surfnet\/Stepup\/Identity\/Event\/PhoneRecoveryTokenPossessionProvenEvent.php on line 136"]}

I would expect an error message indicating the personId is unknown, and "status":"ERROR"