diff --git a/VERSION b/VERSION
index 7038453c..3503add4 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-xorm v0.5.4.0427
+xorm v0.5.4.0508
diff --git a/helpers.go b/helpers.go
index 617e8d7a..5fdef5bf 100644
--- a/helpers.go
+++ b/helpers.go
@@ -159,7 +159,7 @@ func isStructZero(v reflect.Value) bool {
 				return false
 			}
 		default:
-			if !isZero(field.Interface()) {
+			if field.CanInterface() && !isZero(field.Interface()) {
 				return false
 			}
 		}
diff --git a/xorm.go b/xorm.go
index 0fdae547..f2f034af 100644
--- a/xorm.go
+++ b/xorm.go
@@ -17,7 +17,7 @@ import (
 
 const (
 	// Version show the xorm's version
-	Version string = "0.5.4.0427"
+	Version string = "0.5.4.0508"
 )
 
 func regDrvsNDialects() bool {