diff --git a/addons/wiki/static/src/js/wiki.js b/addons/wiki/static/src/js/wiki.js
index 7b84ff5080c..8d68fed22e6 100644
--- a/addons/wiki/static/src/js/wiki.js
+++ b/addons/wiki/static/src/js/wiki.js
@@ -6,7 +6,7 @@ openerp.wiki = function (openerp) {
     openerp.wiki = {};
     openerp.wiki.FieldWikiReadonly = openerp.web.page.FieldCharReadonly.extend({
         set_value: function (value) {
-            var show_value = wiky.process(value);
+            var show_value = wiky.process(value || '');
             this.$element.find('div').html(show_value);
             return show_value;
         }