diff --git a/framework/base/Widget.php b/framework/base/Widget.php
index d578ae485a..c9850cd8ce 100644
--- a/framework/base/Widget.php
+++ b/framework/base/Widget.php
@@ -156,7 +156,7 @@ class Widget extends Component implements ViewContextInterface
     /**
      * Returns the ID of the widget.
      * @param bool $autoGenerate whether to generate an ID if it is not set previously
-     * @return string ID of the widget.
+     * @return string|null ID of the widget.
      */
     public function getId($autoGenerate = true)
     {