--- /greenstone/greenstone-documentation/packages/dokuwiki-2011-05-25a/inc/parserutils.php	2012-02-01 16:03:06.000000000 +1300
+++ parserutils.php	2013-09-19 10:46:58.000000000 +1200
@@ -522,7 +522,12 @@ function p_render_metadata($id, $orig){
         // loop through the instructions
         foreach ($instructions as $instruction){
             // execute the callback against the renderer
-            call_user_func_array(array(&$renderer, $instruction[0]), (array) $instruction[1]);
+	    // - check we can, first, otherwise logs fill up with warnings
+	    $handler = array(&$renderer, $instruction[0]);
+	    if (is_callable($handler))
+            {
+              call_user_func_array($handler, (array) $instruction[1]);
+	    }
         }
 
         $evt->result = array('current'=>&$renderer->meta,'persistent'=>&$renderer->persistent);