SQL error when deleting configurations

I'm experiencing an error when I try to delete a configuration from the frontend, eg:

DELETE http://rz-vm64.gfz-potsdam.de:5000/rdm/svm-api/v1/configurations/32

returns:

STATUS: 500 INTERNAL SERVER ERROR
{
  "errors":[
    {
      "detail":"Delete object error: (psycopg2.errors.NotNullViolation) null value in column \"configuration_id\" violates not-null constraint\nDETAIL:  Failing row contains (2021-08-23 09:21:36.678693, 2021-08-24 11:22:32.644983, 24, null, 279, null, 2021-08-23 09:12:34.586, , 14, 0, 0, 0, 6, 6).\n\n[SQL: UPDATE device_mount_action SET updated_at=%(updated_at)s, configuration_id=%(configuration_id)s WHERE device_mount_action.id = %(device_mount_action_id)s]\n[parameters: {'updated_at': datetime.datetime(2021, 8, 24, 11, 22, 32, 644983), 'configuration_id': None, 'device_mount_action_id': 24}]\n(Background on this error at: http://sqlalche.me/e/14/gkpj)",
      "status":"500",
      "title":"Unknown error"
    }
  ],
  "jsonapi":{
    "version":"1.0"
  }
}

It looks like the ON DELETE constraint for the referenced tables was not set to CASCADE...