diff --git a/serializer.js b/serializer.js
index 08ae751..724da10 100644
--- a/serializer.js
+++ b/serializer.js
@@ -1,3 +1,14 @@
+HTMLElement.prototype.isChildOf = function(parent){
+	var node = this.parentNode;
+	while (node != null) {
+		if (node == parent) {
+			return true;
+		}
+		node = node.parentNode;
+	}
+	return false;
+}
+
 class SerializerField {
 	/**
 	 * constructor
@@ -36,12 +47,15 @@ class Serializer {
 	 * @returns {Serializer}
 	 */
 	constructor(element){
-		let fields = element.querySelectorAll(`:scope > input:not([type="submit"]), :scope > select, :scope > textarea, :scope > group`);
+		let fields = element.querySelectorAll(`:scope input:not([type="submit"]), :scope select, :scope textarea, :scope group`);
+		let groups = [].slice.call(element.querySelectorAll(`:scope group`));
 
 		this._fields = new Map();
 
 		for(let f of fields){
-			this.addField(f);
+			if(f.isChildOf(element) && groups.every(g => !f.isChildOf(g))){
+				this.addField(f);
+			}
 		}
 	}
 
diff --git a/tests/main.go b/tests/main.go
index 7b93d94..4074621 100644
--- a/tests/main.go
+++ b/tests/main.go
@@ -101,6 +101,7 @@ func postTest(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
 	var p []*Person
 
 	body := json.NewDecoder(r.Body)
+
 	err := body.Decode(&p)
 	if err != nil {
 		fmt.Println(color.RedString(err.Error()))
@@ -128,18 +129,25 @@ func isEq(p1, p2 Person) {
 	assert(p1.Surname, p2.Surname, "Surname")
 	assert(p1.Age, p2.Age, "Age")
 	assert(p1.BirthDate, p2.BirthDate, "BirthDate")
-	for k := range p1.Languages {
+	if !assert(len(p2.Languages), len(p1.Languages), "Languages length") {
+		return
+	}
+	for k := range p2.Languages {
 		assert(p1.Languages[k].Language, p2.Languages[k].Language, "Languages.Language")
 		assert(p1.Languages[k].SkillLevel, p2.Languages[k].SkillLevel, "Languages.SkillLevel")
 		assert(p1.Languages[k].Native, p2.Languages[k].Native, "Languages.Native")
 	}
 }
 
-func assert(v, v2 interface{}, ident string) {
+func assert(v, v2 interface{}, ident string) bool {
+	pass := true
 	if !reflect.DeepEqual(v, v2) {
 		fmt.Fprint(tw, color.RedString("FAIL\t"))
+		pass = false
 	} else {
 		fmt.Fprint(tw, color.GreenString("PASS\t"))
 	}
 	fmt.Fprintf(tw, "%s\t%s\n", color.BlueString(ident), color.YellowString(fmt.Sprintf("'%v'\t'%v'", v, v2)))
+
+	return pass
 }
diff --git a/tests/templates/test.gohtml b/tests/templates/test.gohtml
index dd15d84..5947be9 100644
--- a/tests/templates/test.gohtml
+++ b/tests/templates/test.gohtml
@@ -25,7 +25,9 @@
 						<input name="birth_date" type="date" value="{{ $p.BirthDate.Format "2006-01-02" }}">
 						{{ range $p.Languages }}
 							<group name="[]languages">
-								<input name="language" type="text" value="{{ .Language }}">
+								<label>
+									<input name="language" type="text" value="{{ .Language }}">
+								</label>
 								<input name="native" type="checkbox" {{ if .Native  }} checked {{ end }}>
 								<input name="skill_level" type="number" value="{{ .SkillLevel }}">
 							</group>