diff -u b/includes/common.inc b/includes/common.inc
--- b/includes/common.inc
+++ b/includes/common.inc
@@ -7927,7 +7927,7 @@
   }
   if (is_array($ids)) {
     foreach ($ids as $key => $id) {
-      if (!is_int($id)) {
+      if (!is_numeric($id)) {
         trigger_error("If an array is passed as the second argument to entity_load(), it must contain integers only.");
         unset($ids[$key]);
       }