diff --git a/core/includes/common.inc b/core/includes/common.inc
index 353a9b5..396bc56 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -4417,6 +4417,9 @@ function drupal_pre_render_scripts($elements) {
  */
 function drupal_group_js($javascript) {
   $groups = array();
+  if (empty($javascript)) {
+    return $groups;
+  }
   // If a group can contain multiple items, we track the information that must
   // be the same for each item in the group, so that when we iterate the next
   // item, we can determine if it can be put into the current group, or if a