diff --git a/src/jquery.fancytree.clones.js b/src/jquery.fancytree.clones.js
index <HASH>..<HASH> 100644
--- a/src/jquery.fancytree.clones.js
+++ b/src/jquery.fancytree.clones.js
@@ -230,7 +230,7 @@ $.ui.fancytree._FancytreeNodeClass.prototype.reRegister = function(key, refKey){
 	// Key has changed: update all references
 	if( key != null && key !== this.key ) {
 		if( keyMap[key] ) {
-			$.error("[ext-clones] reRegister(" + key + "): already exists.");
+			$.error("[ext-clones] reRegister(" + key + "): already exists: " + this);
 		}
 		// Update keyMap
 		delete keyMap[prevKey];
@@ -371,7 +371,7 @@ $.ui.fancytree.registerExtension({
 
 		if( add ) {
 			if( keyMap[node.key] != null ) {
-				$.error("clones.treeRegisterNode: node.key already exists: " + node.key);
+				$.error("clones.treeRegisterNode: node.key already exists: " + node);
 			}
 			keyMap[key] = node;
 			if( refKey ) {
Improve logging for ext-clones