diff --git a/includes/common.inc b/includes/common.inc
index 401c053..3bd4559 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -6297,7 +6297,7 @@ function element_children(&$elements, $sort = FALSE) {
   // Filter out properties from the element, leaving only children.
   $children = array();
   $sortable = FALSE;
-  foreach ($elements as $key => $value) {
+  foreach ((array) $elements as $key => $value) {
     if ($key === '' || $key[0] !== '#') {
       $children[$key] = $value;
       if (is_array($value) && isset($value['#weight'])) {