--- a/view_unpublished.module
+++ b/view_unpublished.module	
@@ -102,6 +102,7 @@
  * Implements hook_views_query_substitutions().
  */
 function view_unpublished_views_query_substitutions() {
+  $substitutions = array();
   foreach (node_type_get_types() as $type => $name) {
     $substitutions["***VIEWUNPUBLISHED_$type***"] = intval(user_access('view any unpublished ' . $type . ' content'));
   }