Bug in permissions API

The following API call fails most of the time, giving errors like {"type": "error", "error": {"message": "Something went wrong", "id": "e5140c8320b4464988fe309381b86be2"}}

https://api.bitbucket.org/2.0/teams/thisiszone/permissions/repositories?q=user.account_id<"557058:022fa238-6cd0-4a9b-9f15-e4bb83f1f2d4"+AND+user.account_id!~"c6193fe80b0f"