added additional check to avoid warnings

diff --git a/includes/Title.php b/includes/Title.php
index 8912dbc..e1ee2ac 100644 (file)
--- a/includes/Title.php
+++ b/includes/Title.php
@@ -1223,7 +1223,12 @@ class Title {
         */
        function isSubpage() {
                global $wgNamespacesWithSubpages;
-               return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
+               
+               if( isset( $wgNamespacesWithSubpages[ $this->mNamespace ] ) ) {
+                       return ( strpos( $this->getText(), '/' ) !== false && $wgNamespacesWithSubpages[ $this->mNamespace ] == true );
+               } else {
+                       return false;
+               }
        }
 
        /**