diff --git a/source/java/org/alfresco/repo/web/scripts/workflow/WorkflowModelBuilder.java b/source/java/org/alfresco/repo/web/scripts/workflow/WorkflowModelBuilder.java
index a53074c362..f8ea467a67 100644
--- a/source/java/org/alfresco/repo/web/scripts/workflow/WorkflowModelBuilder.java
+++ b/source/java/org/alfresco/repo/web/scripts/workflow/WorkflowModelBuilder.java
@@ -554,7 +554,7 @@ public class WorkflowModelBuilder
     {
         Map<String, Object> model = new HashMap<String, Object>();
         String id = workflowTransition.getId();
-        model.put(WORKFLOW_NODE_TRANSITION_ID, id);
+        model.put(WORKFLOW_NODE_TRANSITION_ID, id == null ? "" : id);
         model.put(WORKFLOW_NODE_TRANSITION_TITLE, workflowTransition.getTitle());
         model.put(WORKFLOW_NODE_TRANSITION_DESCRIPTION, workflowTransition.getDescription());
         model.put(WORKFLOW_NODE_TRANSITION_IS_DEFAULT, workflowTransition.isDefault());