diff --git a/src/system/base_parsermodule.php b/src/system/base_parsermodule.php
index c1529671..931f2e04 100644
--- a/src/system/base_parsermodule.php
+++ b/src/system/base_parsermodule.php
@@ -47,10 +47,10 @@ function __construct($aOwner = NULL) {
   /**
    * Initialize Plugin
    *
-   * @param papaya_parser $parser
-   * @return bool|void
+   * @param papaya_parser|null $parser
+   * @return void
    */
-  public function initialize($parser) {
+  public function initialize($parser = null) {
     $this->parserObj = $parser;
   }
 
@@ -127,4 +127,4 @@ public function getWebLink(
       return $href;
     }
   }
-}
\ No newline at end of file
+}