diff --git a/src/core/module.js b/src/core/module.js
index 362d02e0..7f8a412b 100644
--- a/src/core/module.js
+++ b/src/core/module.js
@@ -125,6 +125,10 @@ define(function(require, exports, module) {
             }
         },
 
+        clearSelect: function() {
+            this.removeAllSelectedNodes();
+        },
+
         destroy: function() {
             var modules = this._modules;
 
diff --git a/src/module/resource.js b/src/module/resource.js
index d672f6c4..052148fb 100644
--- a/src/module/resource.js
+++ b/src/module/resource.js
@@ -262,7 +262,7 @@ define(function(require, exports, module) {
                  *  @date 2016-01-15
                  */
                 var resource = node.getData("resource").filter(function(ele) {
-                    return ele !== null;
+                    return ele !== null && ele !== undefined;
                 });
                 if (resource.length === 0) {
                     return;