xdebug exception fatal

xdebugexception.php

<?php

ini_set("display_errors", 1);
ini_set("error_reporting", E_ALL);
echo "<pre>";

class MyException extends Exception {
    function __construct($message) {
        parent::__construct($message);
        $this->line = "42"; // this triggers it. if it's before the constructor, PHP freaks out regardless of xdebug
    }
}

try {
    throw new MyException();
} catch (Exception $ex) {
    var_dump ($ex);
}

echo "survived";

/*

 without xdebug:
 
object(MyException)#93 (7) {
  ["message":protected]=>
  string(3) "BLA"
  ["string":"Exception":private]=>
  string(0) ""
  ["code":protected]=>
  int(0)
  ["file":protected]=>
  string(61) "/www/deviantart.lan/xdebugexception.php"
  ["line":protected]=>
  string(2) "42"
  ["trace":"Exception":private]=>
  array(0) {
  }
  ["previous":"Exception":private]=>
  NULL
}
survived

 with xdebug:
( ! ) Fatal error: Your exception class uses incorrect types for common properties: 'message' and 'file' need to be a string and 'line' needs to be an integer. in /www/deviantart.lan/xdebugexception.php on line 17

*/