--- class-wp-error-o.php	2014-09-08 11:34:08.000000000 +0200
+++ class-wp-error-n.php	2014-09-08 11:37:30.000000000 +0200
@@ -75,7 +75,11 @@
 	 * @return mixed Property.
 	 */
 	public function __get( $name ) {
-		return $this->$name;
+		$ret = null;
+		if ( isset( $this->$name ) ) {
+			$ret = $this->$name;
+		}
+		return $ret;
 	}
 
 	/**