[merk]

I dont know how the above error could occur - remember that there is a 'username' and a 'userid' field, and it seems you entered username into userid.

However, to make the error go away(you wont get any results tho) line 193ish

PHP Code:

  elseif ($searchuserid!="") {
          $condition.=" AND user.userid=$searchuserid";
  } 


replace with

PHP Code:

  elseif ($searchuserid!="") {
          $condition.=" AND user.userid=\"$searchuserid\"";
  }