Index: modules/contextual/contextual.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/contextual/contextual.module,v
retrieving revision 1.8
diff -u -p -r1.8 contextual.module
--- modules/contextual/contextual.module	11 Sep 2010 14:35:13 -0000	1.8
+++ modules/contextual/contextual.module	26 Oct 2010 22:25:19 -0000
@@ -95,7 +95,7 @@ function contextual_preprocess(&$variabl
   }
 
   // Determine the primary theme function argument.
-  if (isset($hooks[$hook]['variables'])) {
+  if (!empty($hooks[$hook]['variables'])) {
     $keys = array_keys($hooks[$hook]['variables']);
     $key = $keys[0];
   }