diff --git a/mindplot/src/main/javascript/persistence/XMLSerializer_Pela.js b/mindplot/src/main/javascript/persistence/XMLSerializer_Pela.js
index 312b18db..e1669a34 100644
--- a/mindplot/src/main/javascript/persistence/XMLSerializer_Pela.js
+++ b/mindplot/src/main/javascript/persistence/XMLSerializer_Pela.js
@@ -305,7 +305,7 @@ mindplot.persistence.XMLSerializer_Pela = new Class({
         }
 
         var order = domElem.getAttribute('order');
-        if ($defined(order)) {
+        if ($defined(order) && order!="NaN") { // Hack for broken maps ...
             topic.setOrder(parseInt(order));
         }