diff --git a/core/modules/user/src/UserData.php b/core/modules/user/src/UserData.php
index a5bc100..fe7fc22 100644
--- a/core/modules/user/src/UserData.php
+++ b/core/modules/user/src/UserData.php
@@ -78,10 +78,9 @@ public function get($module, $uid = NULL, $name = NULL) {
    * {@inheritdoc}
    */
   public function set($module, $uid, $name, $value) {
-    $serialized = 0;
-    if (!is_scalar($value)) {
+    $serialized = (int) !is_scalar($value);
+    if ($serialized) {
       $value = serialize($value);
-      $serialized = 1;
     }
     $this->connection->merge('users_data')
       ->keys([