diff --git a/repository/src/main/java/org/alfresco/repo/content/transform/TransformerDebug.java b/repository/src/main/java/org/alfresco/repo/content/transform/TransformerDebug.java
index c87fe1d786..8e762f953f 100644
--- a/repository/src/main/java/org/alfresco/repo/content/transform/TransformerDebug.java
+++ b/repository/src/main/java/org/alfresco/repo/content/transform/TransformerDebug.java
@@ -138,7 +138,7 @@ public class TransformerDebug
 
     protected static class Frame
     {
-        private static final AtomicInteger uniqueId = new AtomicInteger(0);
+        private static final AtomicInteger uniqueId = new AtomicInteger(1);
 
         private int id;
         private final String fromUrl;