diff --git a/example/app/category.go b/example/app/category.go
index dba7256..627e1ea 100644
--- a/example/app/category.go
+++ b/example/app/category.go
@@ -9,22 +9,22 @@ var categoryCtr = Ctr{
 	"info": func(that *Context) {
 		parentId := ObjToInt(that.Req.FormValue("id"))
 		//parentId := ObjToInt(that.RouterString[2])
-		childData:=[]Map{}
+		childData := []Map{}
 		if parentId == 0 {
 			childData1 := that.Db.Select("category", "*", Map{"parent_id": nil})
 
 			for _, v := range childData1 {
 				data := that.Db.Get("category", "*", Map{"parent_id": v.GetCeilInt("id")})
-				childData=append(childData,data)
+				if data != nil {
+					childData = append(childData, data)
+				}
+
 			}
 
-
-		}else{
+		} else {
 			childData = that.Db.Select("category", "*", Map{"parent_id": parentId})
 		}
 
-
-
 		for _, v := range childData {
 			v["child"] = that.Db.Select("category", "*", Map{"parent_id": v.GetCeilInt("id")})
 		}
diff --git a/example/bzyy.exe b/example/bzyy.exe
index 5620a3f..3172af2 100644
Binary files a/example/bzyy.exe and b/example/bzyy.exe differ