diff --git a/mindplot/src/main/javascript/Topic.js b/mindplot/src/main/javascript/Topic.js
index 811b16ee..17d4c29e 100644
--- a/mindplot/src/main/javascript/Topic.js
+++ b/mindplot/src/main/javascript/Topic.js
@@ -468,7 +468,7 @@ mindplot.Topic = new Class({
 
     setText:function (text) {
         // Avoid empty nodes ...
-        if (text.trim().length == 0) {
+        if (!text || text.trim().length == 0) {
             text = null;
         }