diff --git a/src/base/combination/expander.js b/src/base/combination/expander.js
index 58c3ed70b..4e6ab7b58 100644
--- a/src/base/combination/expander.js
+++ b/src/base/combination/expander.js
@@ -197,7 +197,7 @@ BI.Expander = BI.inherit(BI.Widget, {
     populate: function (items) {
         // this._assertPopupView();
         this.popupView && this.popupView.populate.apply(this.popupView, arguments);
-        this.expander.populate.apply(this.expander, arguments);
+        this.expander.populate && this.expander.populate.apply(this.expander, arguments);
     },
 
     _setEnable: function (arg) {
diff --git a/src/base/combination/switcher.js b/src/base/combination/switcher.js
index e3a73bcda..cdaaf88de 100644
--- a/src/base/combination/switcher.js
+++ b/src/base/combination/switcher.js
@@ -194,7 +194,7 @@ BI.Switcher = BI.inherit(BI.Widget, {
     populate: function (items) {
         this._assertPopupView();
         this.popupView.populate.apply(this.popupView, arguments);
-        this.switcher.populate.apply(this.switcher, arguments);
+        this.switcher.populate && this.switcher.populate.apply(this.switcher, arguments);
     },
 
     _setEnable: function (arg) {