error after deleting user

[gubuntu]

I deleted a duplicate VictorSambo user in Admin and after confirming deletion got

'There was a problem loading this page'

http://geonode.ingc.gov.mz/en/admin/people/profile/1020/

and he was not deleted

[boney-bun]

the error is caused by a constraint on people_profile table in production.
the constraint will check account_account table on user deletion.

interestingly, the same table constraint doesn't exist in the testing server and in my local machine.
in another word, account_account table and its relation in people_people table shouldn't be existed in the production's db.