diff -u b/core/modules/user/user.module b/core/modules/user/user.module
--- b/core/modules/user/user.module
+++ b/core/modules/user/user.module
@@ -428,8 +428,10 @@
   $entities = entity_load_multiple('user_role', array_keys($roles));
   foreach ($roles as $rid => $name) {
     $role_permissions[$rid] = array();
-    foreach ($entities[$rid]->permissions as $permission) {
-      $role_permissions[$rid][$permission] = TRUE;
+    if (isset($entities[$rid])) {;
+      foreach ($entities[$rid]->permissions as $permission) {
+        $role_permissions[$rid][$permission] = TRUE;
+      }
     }
   }
   return $role_permissions;