My join is not working

I have a search field in my form which searches data from a database and displays it on a result page. When I try to search data I get this error.

A PHP Error was encountered

Severity: Notice

Message: Undefined index: names

Filename: views/searchresults.php

Line Number: 43

I know the data I am passing to the view does not contain the 'names'  field which means the query I am using is not retrieving this value from the database. Here is my database query

Code:

//this function gets all the contacts given a cerain parameter
   public function search_data($param) {
       
           //query
           $this->db->select('users,numbers');
           $this->db->from('phones');
           $this->db->like('phones.users',$param);
           $this->db->or_like('phones.numbers', $param);
           $this->db->or_like('offices.names', $param);
           $this->db->join('offices', 'phones.offices = offices.id', 'left');
         

           //return the result
           $query = $this->db->get();

           return $query->result_array();
       
   }

The 'names' field is in my office table, thus it must be my join function which is not working. Any help will be greatly appreciated