1 files changed, 3 insertions, 3 deletions
diff --git a/ui/include/classes/helpers/CDocHelper.php b/ui/include/classes/helpers/CDocHelper.php
index 03287ed8936..a1f2b3095b2 100644
--- a/ui/include/classes/helpers/CDocHelper.php
+++ b/ui/include/classes/helpers/CDocHelper.php
@@ -153,15 +153,15 @@ class CDocHelper {
 	const USERS_USERROLE_EDIT =									'web_interface/frontend_sections/users/user_roles#default-user-roles';
 	const USERS_USERROLE_LIST =									'web_interface/frontend_sections/users/user_roles';
 
-	public static function getUrl($path): ?string {
+	public static function getUrl($path): string {
 		if (CBrandHelper::isRebranded()) {
-			return null;
+			return '';
 		}
 
 		if (preg_match('/^\d+\.\d+/', ZABBIX_VERSION, $version)) {
 			return ZBX_DOCUMENTATION_URL.'/'.$version[0].'/en/manual/'.$path;
 		}
 
-		return null;
+		return '';
 	}
 }