From 3d4a143814d24d9d992b10f27e6a0cf113ee46d5 Mon Sep 17 00:00:00 2001
From: Lunny Xiao <xiaolunwen@gmail.com>
Date: Sun, 29 May 2016 16:47:54 +0800
Subject: [PATCH] bug fixed

---
 helpers.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/helpers.go b/helpers.go
index 5fdef5bf..3b4d01f1 100644
--- a/helpers.go
+++ b/helpers.go
@@ -148,6 +148,10 @@ func isZero(k interface{}) bool {
 }
 
 func isStructZero(v reflect.Value) bool {
+	if !v.IsValid() {
+		return true
+	}
+
 	for i := 0; i < v.NumField(); i++ {
 		field := v.Field(i)
 		switch field.Kind() {