diff --git a/addons/web/static/src/js/search.js b/addons/web/static/src/js/search.js
index fcfcfb08f8e..83eaecd845a 100644
--- a/addons/web/static/src/js/search.js
+++ b/addons/web/static/src/js/search.js
@@ -71,7 +71,10 @@ my.SearchQuery = B.Collection.extend({
     },
     add: function (values, options) {
         options = options || {};
-        if (!(values instanceof Array)) {
+
+        if (!values) {
+            values = [];
+        } else if (!(values instanceof Array)) {
             values = [values];
         }