diff -r c87698c8cde6 -r 3f4094a5c826 client/js/paper-renderer.js
--- a/client/js/paper-renderer.js	Wed Apr 09 17:28:44 2014 +0200
+++ b/client/js/paper-renderer.js	Fri Apr 25 15:22:17 2014 +0200
@@ -2553,8 +2553,11 @@
     }
     
     // Option management : drop handler
-    if(typeof _renkan.options.drop_handler === "undefined"){
-    	_renkan.options.drop_handler = function(_data){
+    if(typeof _renkan === "undefined"){
+    	_renkan = this.renkan;
+    }
+    if(typeof this.renkan.options.drop_handler === "undefined"){
+    	this.renkan.options.drop_handler = function(_data){
     		var newNode = {};
 	    	switch(_data["text/x-iri-specific-site"]) {
 		        case "twitter":
@@ -2627,7 +2630,7 @@
     	};
     }
     
-    var newNode = _renkan.options.drop_handler(_data);
+    var newNode = this.renkan.options.drop_handler(_data);
     
     if (!newNode.title) {
         newNode.title = this.renkan.translate("Dragged resource");