Index: collapse_text.module
===================================================================
--- collapse_text.module	(revision 49)
+++ collapse_text.module	(working copy)
@@ -611,7 +611,7 @@
   }
 }
 
-function _collapse_text_preprocess_page_walk_callback ($val, $key, &$found) {
+function _collapse_text_preprocess_page_walk_callback ($val, $key, $found) {
   if (($key === '#markup') and ( stripos($val, 'collapse-text-fieldset') !== FALSE )) {
     $found = TRUE;
   }