diff --git a/inc/mod/pages.php b/inc/mod/pages.php
index 3cdf1374..f8a29c7d 100644
--- a/inc/mod/pages.php
+++ b/inc/mod/pages.php
@@ -1032,7 +1032,7 @@ function mod_bans_json() {
                 error($config['error']['noaccess']);
 
 	// Compress the json for faster loads
-	if (substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip')) ob_start("ob_gzhandler");
+	if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && substr_count($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip')) ob_start("ob_gzhandler");
 
 	Bans::stream_json(false, !hasPermission($config['mod']['show_ip']), !hasPermission($config['mod']['view_banstaff']), $mod['boards']);
 }