diff --git a/addons/web/static/src/js/view_form.js b/addons/web/static/src/js/view_form.js
index d7b3a6805d9..ac54df69309 100644
--- a/addons/web/static/src/js/view_form.js
+++ b/addons/web/static/src/js/view_form.js
@@ -4026,6 +4026,9 @@ instance.web.form.FieldMany2ManyTags = instance.web.form.AbstractField.extend(in
         }
         this._super(value_);
     },
+    is_false: function() {
+        return _(this.get("value")).isEmpty();
+    },
     get_value: function() {
         var tmp = [commands.replace_with(this.get("value"))];
         return tmp;