diff --git a/block_tab.module b/block_tab.module
old mode 100644
new mode 100755
index ece5187..d1e3880
--- a/block_tab.module
+++ b/block_tab.module
@@ -39,7 +39,7 @@ function block_tab_perm() {
  */
 function block_tab_preprocess_block(&$vars) {
   $region_setting = variable_get('block_tab-regions', array());
-  if ($region_setting[$vars['elements']['#block']->region]) {
+  if (isset($region_setting[$vars['elements']['#block']->region])) {
     $vars['elements']['#block']->title = $vars['elements']['#block']->subject;
     $vars['elements']['#block']->subject = null;
   }