diff --git a/src/Controller/VarnishAdvController.php b/src/Controller/VarnishAdvController.php
index f73376d..46957cf 100644
--- a/src/Controller/VarnishAdvController.php
+++ b/src/Controller/VarnishAdvController.php
@@ -175,7 +175,7 @@ class VarnishAdvController {
     }
     else {
       // Bin for anon user.
-      $cookie_inf = $cookie_bin = 'anonymous';
+      $cookie_inf = $cookie_bin = '';
     }
 
     // Set BIN header for debug.
@@ -184,7 +184,8 @@ class VarnishAdvController {
     }
 
     // Update cookies if did not match.
-    if (empty($_COOKIE[static::ADV_VARNISH_COOKIE_BIN]) || ($_COOKIE[static::ADV_VARNISH_COOKIE_BIN] != $cookie_bin)) {
+    $old_cookie = $_COOKIE[static::ADV_VARNISH_COOKIE_BIN] ?? '';
+    if ($old_cookie != $cookie_bin) {
 
       // Update cookies.
       $params = session_get_cookie_params();