diff --git a/sources/application/UI/Component/Form/Form.php b/sources/application/UI/Component/Form/Form.php
index 56dedd331c..26a1ff5c5d 100644
--- a/sources/application/UI/Component/Form/Form.php
+++ b/sources/application/UI/Component/Form/Form.php
@@ -49,7 +49,7 @@ class Form extends UIContentBlock
 	/**
 	 * @return string
 	 */
-	public function GetAction(): string
+	public function GetAction(): ?string
 	{
 		return $this->sAction;
 	}