diff --git a/app/tests/benchmarks_test.go b/app/tests/benchmarks_test.go
index 69bcdae..fd9909b 100644
--- a/app/tests/benchmarks_test.go
+++ b/app/tests/benchmarks_test.go
@@ -154,7 +154,7 @@ func BenchmarkListJSON (b *testing.B) {
 
 //var ma = map[string]string {"{asd1/>":"344343","{asd2/>":"4343434","{asd41/>":"frtrtrtr"}
 
-var  ma = map[string]int {"{basd1/>":344343,"{casd2/>":4343434,"{asd41/>":67,"{ba2sd1/>":344343,"{11casd2/>":4343434,"{33asd41/>":67}
+var  mas = map[string]int {"{basd1/>":344343,"{casd2/>":4343434,"{asd41/>":67,"{ba2sd1/>":344343,"{11casd2/>":4343434,"{33asd41/>":67}
 
 
 func BenchmarkMapPack (b *testing.B) {
@@ -171,4 +171,109 @@ func BenchmarkMapJSON (b *testing.B) {
 	for i:=0; i< b.N; i++ {
 		j.Marshal(ma)
 	}
-}
\ No newline at end of file
+}
+
+
+
+var ma = map[string]string {
+"clave0": "valor123",
+"clave1": "rojo",
+"clave2": "valor456",
+"clave3": "azul",
+"clave4": "valor789",
+"clave5": "verde",
+"clave6": "valor012",
+"clave7": "amarillo",
+"clave8": "valor345",
+"clave9": "naranja",
+"clave10": "valor678",
+"clave11": "morado",
+"clave12": "valor901",
+"clave13": "grande",
+"clave14": "valor234",
+"clave15": "pequeño",
+"clave16": "valor567",
+"clave17": "rápido",
+"clave18": "valor890",
+"clave19": "lento",
+"clave20": "valor123",
+"clave21": "rojo",
+"clave22": "valor456",
+"clave23": "azul",
+"clave24": "valor789",
+"clave25": "verde",
+"clave26": "valor012",
+"clave27": "amarillo",
+"clave28": "valor345",
+"clave29": "naranja",
+"clave30": "valor678",
+"clave31": "morado",
+"clave32": "valor901",
+"clave33": "grande",
+"clave34": "valor234",
+"clave35": "pequeño",
+"clave36": "valor567",
+"clave37": "rápido",
+"clave38": "valor890",
+"clave39": "lento",
+"clave40": "valor123",
+"clave41": "rojo",
+"clave42": "valor456",
+"clave43": "azul",
+"clave44": "valor789",
+"clave45": "verde",
+"clave46": "valor012",
+"clave47": "amarillo",
+"clave48": "valor345",
+"clave49": "naranja",
+"clave50": "valor678",
+"clave51": "morado",
+"clave52": "valor901",
+"clave53": "grande",
+"clave54": "valor234",
+"clave55": "pequeño",
+"clave56": "valor567",
+"clave57": "rápido",
+"clave58": "valor890",
+"clave59": "lento",
+"clave60": "valor123",
+"clave61": "rojo",
+"clave62": "valor456",
+"clave63": "azul",
+"clave64": "valor789",
+"clave65": "verde",
+"clave66": "valor012",
+"clave67": "amarillo",
+"clave68": "valor345",
+"clave69": "naranja",
+"clave70": "valor678",
+"clave71": "morado",
+"clave72": "valor901",
+"clave73": "grande",
+"clave74": "valor234",
+"clave75": "pequeño",
+"clave76": "valor567",
+"clave77": "rápido",
+"clave78": "valor890",
+"clave79": "lento",
+"clave80": "valor123",
+"clave81": "rojo",
+"clave82": "valor456",
+"clave83": "azul",
+"clave84": "valor789",
+"clave85": "verde",
+"clave86": "valor012",
+"clave87": "amarillo",
+"clave88": "valor345",
+"clave89": "naranja",
+"clave90": "valor678",
+"clave91": "morado",
+"clave92": "valor901",
+"clave93": "grande",
+"clave94": "valor234",
+"clave95": "pequeño",
+"clave96": "valor567",
+"clave97": "rápido",
+"clave98": "valor890",
+"clave99": "lento",
+}
diff --git a/packs/js/gogo.go b/packs/js/gogo.go
index f0b55a2..dc06892 100644
--- a/packs/js/gogo.go
+++ b/packs/js/gogo.go
@@ -30,6 +30,9 @@ import (
 	"unicode/utf8"
 )
 
+
+const startDetectingCyclesAfter = 100
+
 var (
 	G = struct {
 		hex       string
diff --git a/packs/js/type_map_packer.go b/packs/js/type_map_packer.go
index 9c9280e..3b4f608 100644
--- a/packs/js/type_map_packer.go
+++ b/packs/js/type_map_packer.go
@@ -26,7 +26,6 @@ package js
 import (
 	"activething.com/go/gogo/packs"
 	"encoding"
-	"fmt"
 	"reflect"
 	"sort"
 	"strconv"
@@ -68,6 +67,15 @@ func (m typeMapPacker) pack (s *packs.State, v reflect.Value, _ Flags) {
 	mi := v.MapRange()
 	ls := make([]typeMapEntry,v.Len())
 
+	if s.Level > startDetectingCyclesAfter {
+		pt := v.UnsafePointer()
+		if _,hs := s.Checks[pt]; hs {
+			s.SetError(packs.G.ErrRedundantPack)
+		}
+		s.Checks[pt]=struct{}{}
+		defer delete(s.Checks,pt)
+	}
+
 
 	for i:=0; mi.Next(); i++ {
 		ls[i] = typeMapEntry{
@@ -75,7 +83,6 @@ func (m typeMapPacker) pack (s *packs.State, v reflect.Value, _ Flags) {
 		}
 
 		if er := m.keyStringer(&ls[i], mi.Key()); er != nil {
-			fmt.Printf("Error Ke %d--%v\n",mi.Key(),mi.Key().Type())
 			s.SetError(er)
 			return
 		}
@@ -153,7 +160,6 @@ func buildKeyStringer(rt reflect.Type) func(me *typeMapEntry, key reflect.Value)
 		return func(e *typeMapEntry, k reflect.Value) error {
 			k = k.Elem()
 
-			fmt.Printf("Ejecutando packer general\n %v\n",k)
 			if k.Type().Kind() == reflect.String {
 				e.key = k.String()
 				e.flags = FlagScapeHTML