No oversight or dereliction on the part of any official or employee of the City vested with the authority to issue permits or licenses shall legalize, authorize, waive, or excuse the violation of any of the provisions of this Chapter, nor shall any permit or license be issued for any use, building, or purpose which would be in conflict with such provisions or with any other law in force or adopted on or after May 4, 1978. Any permit or license so issued shall be null and void.