Codeigniter IS NULL in find_in_set

Auto adding the IS NULL in FIND_IN_SET 100% solved

You need to add !=0 is your where clause to remove IS NULL

$this->db->select('id,name,category,sent_by,read_by,date');
    $this->db->from('name');
    $this->db->where("FIND_IN_SET('1',`category`) !=", 0);
    $this->db->order_by('`id`','DESC');
    $this->db->get();