diff --git a/backend/destination.go b/backend/destination.go
index f18e6e3..44f4288 100644
--- a/backend/destination.go
+++ b/backend/destination.go
@@ -56,6 +56,8 @@ func CheckOfflineDestinations(nowTimeStamp int64) {
 				if err != nil {
 					utils.DebugPrintln("Unmarshal K8S API", err)
 				}
+				dest.Mutex.Lock()
+				defer dest.Mutex.Unlock()
 				dest.Pods = ""
 				for _, podItem := range pods.Items {
 					if podItem.Status.Phase == "Running" {
diff --git a/backend/k8s.go b/backend/k8s.go
index c07cc97..b52f51d 100644
--- a/backend/k8s.go
+++ b/backend/k8s.go
@@ -13,36 +13,64 @@ import (
 	"janusec/utils"
 	"net/http"
 	"strings"
+	"sync"
 	"time"
 )
 
+func UpdatePods(dest *models.Destination, nowTimeStamp int64) {
+	dest.IsUpdating = true
+	dest.Mutex.Lock() // write lock
+	defer dest.Mutex.Unlock()
+	request, _ := http.NewRequest("GET", dest.PodsAPI, nil)
+	request.Header.Set("Content-Type", "application/json")
+	resp, err := utils.GetResponse(request)
+	if err != nil {
+		utils.DebugPrintln("Check K8S API GetResponse", err)
+		dest.CheckTime = nowTimeStamp
+		dest.Online = false
+	}
+	pods := models.PODS{}
+	err = json.Unmarshal(resp, &pods)
+	if err != nil {
+		utils.DebugPrintln("Unmarshal K8S API", err)
+	}
+	dest.Pods = ""
+	for _, podItem := range pods.Items {
+		if podItem.Status.Phase == "Running" {
+			if len(dest.Pods) > 0 {
+				dest.Pods += "|"
+			}
+			dest.Pods += podItem.Status.PodIP + ":" + dest.PodPort
+		}
+	}
+	dest.IsUpdating = false
+}
+
 func SelectPodFromDestination(dest *models.Destination, srcIP string, r *http.Request) string {
 	nowTimeStamp := time.Now().Unix()
-	if len(dest.Pods) == 0 || (nowTimeStamp-dest.CheckTime) > 60 {
-		// check k8s api if exceed 60 seconds
-		request, _ := http.NewRequest("GET", dest.PodsAPI, nil)
-		request.Header.Set("Content-Type", "application/json")
-		resp, err := utils.GetResponse(request)
-		if err != nil {
-			utils.DebugPrintln("Check K8S API GetResponse", err)
-			dest.CheckTime = nowTimeStamp
-			dest.Online = false
-		}
-		pods := models.PODS{}
-		err = json.Unmarshal(resp, &pods)
-		if err != nil {
-			utils.DebugPrintln("Unmarshal K8S API", err)
+	var isEmptyPods bool
+	if len(dest.Pods) == 0 {
+		isEmptyPods = true
+	} else {
+		isEmptyPods = false
+	}
+	wg := new(sync.WaitGroup)
+	if !dest.IsUpdating && (isEmptyPods || (nowTimeStamp-dest.CheckTime) > 60) {
+		if isEmptyPods {
+			wg.Add(1)
 		}
-		dest.Pods = ""
-		for _, podItem := range pods.Items {
-			if podItem.Status.Phase == "Running" {
-				if len(dest.Pods) > 0 {
-					dest.Pods += "|"
-				}
-				dest.Pods += podItem.Status.PodIP + ":" + dest.PodPort
+		// check k8s api if exceed 60 seconds
+		go func(dest *models.Destination, nowTimeStamp int64, wg *sync.WaitGroup) {
+			UpdatePods(dest, nowTimeStamp)
+			if isEmptyPods {
+				wg.Done()
 			}
-		}
+		}(dest, nowTimeStamp, wg)
+	}
+	if isEmptyPods {
+		wg.Wait()
 	}
+	dest.Mutex.RLock()
 	// select target pod from dest.Pods directly
 	dests := strings.Split(dest.Pods, "|")
 	// According to Hash(IP+UA)
@@ -53,6 +81,7 @@ func SelectPodFromDestination(dest *models.Destination, srcIP string, r *http.Re
 	}
 	hashUInt32 := h.Sum32()
 	destIndex := hashUInt32 % uint32(len(dests))
+	dest.Mutex.RUnlock()
 	return dests[destIndex]
 }
 
diff --git a/data/data.go b/data/data.go
index 84b072e..6f094aa 100644
--- a/data/data.go
+++ b/data/data.go
@@ -33,7 +33,7 @@ var (
 	// IsPrimary i.e. Is Primary Node
 	IsPrimary bool
 	// Version of JANUSEC
-	Version = "1.3.0"
+	Version = "1.3.1"
 	// NodeKey share with all nodes
 	NodeKey []byte
 )
diff --git a/firewall/cc.go b/firewall/cc.go
index 3b55b34..3408e94 100644
--- a/firewall/cc.go
+++ b/firewall/cc.go
@@ -53,6 +53,8 @@ func CCAttackTick(appID int64) {
 			clientID := key.(string)
 			stat := value.(*models.ClientStat)
 			//fmt.Println("CCAttackTick:", appID, clientID, stat)
+			stat.Mutex.Lock()
+			defer stat.Mutex.Unlock()
 			if stat.IsBadIP {
 				stat.RemainSeconds -= ccPolicy.IntervalMilliSeconds / 1000.0
 				if stat.RemainSeconds <= 0 {
@@ -135,6 +137,8 @@ func IsCCAttack(r *http.Request, app *models.Application, srcIP string) (bool, *
 	clientID := data.SHA256Hash(preHashContent)
 	clientIDStat, _ := appCCCount.LoadOrStore(clientID, &models.ClientStat{QuickCount: 0, SlowCount: 0, TimeFrameCount: 0, IsBadIP: false, RemainSeconds: 0})
 	clientStat := clientIDStat.(*models.ClientStat)
+	clientStat.Mutex.Lock()
+	defer clientStat.Mutex.Unlock()
 	if clientStat.IsBadIP {
 		needLog := false
 		if clientStat.QuickCount == 0 {
diff --git a/gateway/gateway.go b/gateway/gateway.go
index 6ec9f66..fc8c3c0 100644
--- a/gateway/gateway.go
+++ b/gateway/gateway.go
@@ -388,6 +388,8 @@ func ReverseHandlerFunc(w http.ResponseWriter, r *http.Request) {
 			conn, err := net.Dial("tcp", targetDest)
 			dest.CheckTime = nowTimeStamp
 			if err != nil {
+				dest.Mutex.Lock()
+				defer dest.Mutex.Unlock()
 				dest.Online = false
 				utils.DebugPrintln("DialContext error", err)
 				if data.NodeSetting.SMTP.SMTPEnabled {
diff --git a/models/backend.go b/models/backend.go
index 0de181b..fc6d7df 100644
--- a/models/backend.go
+++ b/models/backend.go
@@ -143,6 +143,10 @@ type Destination struct {
 	// Online status of Destination (IP:Port), added in V0.9.11
 	Online    bool  `json:"online"`
 	CheckTime int64 `json:"check_time"`
+
+	// added in 1.3.1, K8s routine updating and avoid race
+	Mutex      sync.RWMutex `json:"-"`
+	IsUpdating bool         `json:"-"`
 }
 
 // PODS for k8s /api/v1/namespaces/default/pods
diff --git a/models/firewall.go b/models/firewall.go
index 802f24b..2e8af71 100644
--- a/models/firewall.go
+++ b/models/firewall.go
@@ -9,6 +9,7 @@ package models
 
 import (
 	"database/sql"
+	"sync"
 )
 
 type PolicyKey string
@@ -137,6 +138,9 @@ type ClientStat struct {
 
 	// RemainSeconds used for block time frame
 	RemainSeconds float64 //time.Duration
+
+	// added v1.3.1
+	Mutex sync.Mutex
 }
 
 type VulnType struct {
diff --git a/release_batch.sh b/release_batch.sh
index e69dbeb..179b710 100755
--- a/release_batch.sh
+++ b/release_batch.sh
@@ -2,7 +2,7 @@ printf "Creating installation package\n"
 printf "Checklist:\n"
 printf "* Angular Admin Version Check. \n"
 printf "* Janusec Version Check. \n"
-version="1.3.0"
+version="1.3.1"
 printf "Version: ${version} \n"
 
 read -r -p "Are You Sure? [Y/n] " option