diff -u b/includes/common.inc b/includes/common.inc
--- b/includes/common.inc
+++ b/includes/common.inc
@@ -4213,7 +4213,7 @@
 
   // If any JavaScript (except settings) has been added, include the required
   // base libraries, if it's needed.
-  if (array_diff_key($javascript, array('settings' => 0))) {
+  if ($javascript && array_diff_key($javascript, array('settings' => 0))) {
     $need_jquery = TRUE;
     if (!variable_get('javascript_always_use_jquery', TRUE)) {
       $need_jquery = FALSE;