Helpdesk Geeft Error.

<?php
 /*
  * Script voor het weghalen van de beginbescherming.
  */


 if(@$_GET['action'] == "deletesafe") {
    $own['safe'] = 0;
    mysql_query("UPDATE users SET safe = '0' WHERE id = '" . @$own['id'] . "'");
  }
  
  //Functies


  require("includes/class.filter.php");


  function mysql_fetch_query($query)
  {
      if(strtolower(substr($query, 0, 6)) == "select") {
        $selection = mysql_query($query);
        return mysql_fetch_assoc($selection);
      } else {
        die('<b>Parse error</b>: using unexpected query in <b>' . __FILE__ . '</b>, expecting SELECT  on line <b>' . __LINE__ . '</b>');
      }
     } 


  function groot($getal)
  {
      return number_format($getal, 0, '.', '.');
  }
  
  function special_check($userid)
  {
      $user = mysql_fetch_query("SELECT login, admin, moderator, beheerder, vip, health FROM users WHERE id = '" . $userid . "'");
      $name = $user['login'];
      if($user['admin'] == "Ja") {
        $name = '<font color="red"><b>' . $name . '</b></font>';
      } elseif($user['moderator'] == "Ja") {
        $name = '<font color="orange"><b>' . $name . '</b></font>';
      }


      if($user['beheerder'] == "Ja") {
        $name = '<font color="darkred"><b>' . $name . '</b></font>';
      }


      if($user['health'] <= 0) {
        $name = '<s>' . $name . '</s>';
      }


      if($user['vip'] > 0) {
        $name .= '<img src="images/icons/vipstar.gif" border="0">';
      }
      return $name;
  }
  
  function online($userid)
  {
      $user = mysql_num_rows(mysql_query("SELECT id FROM users WHERE id = '" . $userid . "' AND '" . tijd() . "' - UNIX_TIMESTAMP(online) < '180'"));
      if($user > 0) {
        return "<img src=\"images/icons/status_online.gif\" alt=\"Online\">";
      } else {
        return "<img src=\"images/icons/status_offline.gif\" alt=\"Offline\">";
      }
  }
  
  $minutenerbijdateentijd = -4;
  
  function get_global_date($string)
  {
      global $minutenerbijdateentijd;
      $datum = new DateTime(date("Y-m-d H:i:s"));
      $datum->modify("+" . $minutenerbijdateentijd . " minutes");
      return $datum->format($string);
  }
  
  function tijd()
  {
      global $minutenerbijdateentijd;
      return time() + (60 * $minutenerbijdateentijd);
  }
  
  function correct_number_input($number) {
    if(is_numeric($number) && $number >= 0 && $number == floor($number)) {
      return true;
    } else {
      return false;
    }
  }
  
  function missiondone($mission) {
    global $own;
    $mission = mysql_fetch_query("SELECT opdracht, beloning_geld, beloning_power, rank, id FROM missions WHERE id = '" . $mission . "'") or die(mysql_error());
    if($own['rank'] >= $mission['rank'] && !preg_match("/-" . $mission['id'] . "-/", $own['missiesvolbracht'])) {
      $own['missiesvolbracht'] .= "-" . $mission['id'] . "-";
      mysql_query("UPDATE users SET missiesvolbracht = '" . $own['missiesvolbracht'] . "', cash = cash + '" . $mission['beloning_geld'] . "', power = power + '" . $mission['beloning_power'] . "' WHERE id = '" . $own['id'] . "'");
      mysql_query("INSERT INTO berichten (onderwerp, bericht, afzender, geaddresseerde, datum, outbox) VALUES('Missie volbracht!', 'Beste crimineel,rnrnJe hebt een missie volbracht: [b]" . $mission['opdracht'] . "[/b]rnMet vriendelijke groet,rnAnoniem.', 'Anoniem', '" . $own['id'] . "', '" . get_global_date("Y-m-d H:i:s") . "', 'False')") or die(mysql_error());
    }
  }
?>