diff --git a/mindplot/src/main/javascript/persistence/XMLSerializer_Pela.js b/mindplot/src/main/javascript/persistence/XMLSerializer_Pela.js
index e1669a34..78bd4f3b 100644
--- a/mindplot/src/main/javascript/persistence/XMLSerializer_Pela.js
+++ b/mindplot/src/main/javascript/persistence/XMLSerializer_Pela.js
@@ -47,9 +47,14 @@ mindplot.persistence.XMLSerializer_Pela = new Class({
         // Create Relationships
         var relationships = mindmap.getRelationships();
         if (relationships.length > 0) {
+
             for (var j = 0; j < relationships.length; j++) {
-                var relationDom = this._relationshipToXML(document, relationships[j]);
-                mapElem.appendChild(relationDom);
+                var relationship = relationships[j];
+                if (mindmap.findNodeById(relationship.getFromNode()) !== null && mindmap.findNodeById(relationship.getToNode()) !== null) {
+                    // Isolated relationships are not persisted ....
+                    var relationDom = this._relationshipToXML(document, relationship);
+                    mapElem.appendChild(relationDom);
+                }
             }
         }
 
@@ -180,6 +185,7 @@ mindplot.persistence.XMLSerializer_Pela = new Class({
         result.setAttribute("srcTopicId", relationship.getFromNode());
         result.setAttribute("destTopicId", relationship.getToNode());
 
+
         var lineType = relationship.getLineType();
         result.setAttribute("lineType", lineType);
         if (lineType == mindplot.ConnectionLine.CURVED || lineType == mindplot.ConnectionLine.SIMPLE_CURVED) {
@@ -305,7 +311,7 @@ mindplot.persistence.XMLSerializer_Pela = new Class({
         }
 
         var order = domElem.getAttribute('order');
-        if ($defined(order) && order!="NaN") { // Hack for broken maps ...
+        if ($defined(order) && order != "NaN") { // Hack for broken maps ...
             topic.setOrder(parseInt(order));
         }
 
diff --git a/wise-webapp/src/test/resources/data/wisemaps/bug2.xml b/wise-webapp/src/test/resources/data/wisemaps/bug2.xml
new file mode 100644
index 00000000..e69de29b