diff --git a/src/Codeception/Module/Yii2.php b/src/Codeception/Module/Yii2.php
index 45fdde2..fb1c408 100644
--- a/src/Codeception/Module/Yii2.php
+++ b/src/Codeception/Module/Yii2.php
@@ -897,7 +897,7 @@ public function _initializeSession(): void
      */
     public function _backupSession(): array
     {
-        if (isset(Yii::$app) && Yii::$app->session->useCustomStorage) {
+        if (isset(Yii::$app) && Yii::$app->has('session', true) && Yii::$app->session->useCustomStorage) {
             throw new ModuleException($this, "Yii2 MultiSession only supports the default session backend.");
         }
         return [