diff --git a/tls_icon.php b/tls_icon.php
index 497e5e1..af33d61 100644
--- a/tls_icon.php
+++ b/tls_icon.php
@@ -20,7 +20,7 @@ function init()
 	
 	public function storage_init($p)
 	{
-		$p['fetch_headers'] = trim($p['fetch_headers'] . ' ' . strtoupper('Received'));
+		$p['fetch_headers'] = trim(($p['fetch_headers']?? '') . ' ' . strtoupper('Received'));
 		return $p;
 	}