diff --git a/i18n.js b/i18n.js
index 1ce2d47c..8ce1b886 100644
--- a/i18n.js
+++ b/i18n.js
@@ -161,7 +161,7 @@ i18n.prototype = {
 	setLocaleFromQuery: function(req) {
 		req = req || this.request;
 
-		if (!req || !req.query || !req.query.lang) {
+		if (!req || !req.query || !req.query.lang || typeof req.query.lang !== 'string') {
 			return;
 		}