diff --git a/src/com/ectrip/trips/net/HttpHelper.java b/src/com/ectrip/trips/net/HttpHelper.java
index 0c66128..8fff745 100644
--- a/src/com/ectrip/trips/net/HttpHelper.java
+++ b/src/com/ectrip/trips/net/HttpHelper.java
@@ -4,6 +4,7 @@ import java.util.HashMap;
 import java.util.List;
 
 import android.content.Context;
+import android.text.TextUtils;
 import android.widget.Toast;
 
 import com.ectrip.cyt.base.DataTrans;
@@ -67,7 +68,7 @@ public class HttpHelper extends HttpHelperCore {
     public void queryOrder(String method, String code, String phone,
                            String credentials, String orderId, String startDate,
                            String endDate, String pageSize, String count, HttpCallback<DataTrans> httpCallback) {
-        if ((orderId.startsWith("TY_") || (orderId.startsWith("PMS_")))) {
+        if (!TextUtils.isEmpty(orderId) && (orderId.startsWith("TY_") || (orderId.startsWith("PMS_")))) {
             String voucher = orderId;
             orderRequest = new QueryOrderRequest(method, code,
                     phone, credentials, "", startDate, endDate, pageSize, count, voucher);