Index: plugins/styles/tabs.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/panels_tabs/plugins/styles/tabs.inc,v
retrieving revision 1.1.2.5
diff -u -p -r1.1.2.5 tabs.inc
--- plugins/styles/tabs.inc	30 Jul 2010 23:05:44 -0000	1.1.2.5
+++ plugins/styles/tabs.inc	27 Sep 2010 03:05:45 -0000
@@ -42,7 +42,7 @@ function theme_panels_tabs_style_render_
   );
   $index = 0;
   foreach ($panes as $pane_id => $pane_content) {
-    if (!empty($pane_content)) {
+    if (!empty($pane_content) && is_numeric($pane_id)) {
       $tabs[$id][$pane_id] = array(
         '#type'    => 'tabpage',
         '#title'   => $display->content[$pane_id]->tab_title,