diff --git a/settings.php b/settings.php
index d8394df8..a032c9ee 100644
--- a/settings.php
+++ b/settings.php
@@ -223,7 +223,7 @@ if (isset($setupVars["API_PRIVACY_MODE"])) {
 ?>
 
 <?php
-if (in_array($_GET['tab'], array("sysadmin", "blocklists", "dns", "piholedhcp", "api", "teleporter"))) {
+if (isset($_GET['tab']) && in_array($_GET['tab'], array("sysadmin", "blocklists", "dns", "piholedhcp", "api", "teleporter"))) {
     $tab = $_GET['tab'];
 } else {
     $tab = "sysadmin";