diff --git a/cmd/cmd.go b/cmd/cmd.go
index 731b0f25..32d0573b 100644
--- a/cmd/cmd.go
+++ b/cmd/cmd.go
@@ -191,7 +191,6 @@ func Excute() {
 	//
 	//go func() {
 	//	defer wg.Done()
-	err = nil
 	if *udp {
 		if *ipv6Only {
 			fmt.Println("[Info] IPv6 UDP Traceroute is not supported right now.")
diff --git a/trace/trace.go b/trace/trace.go
index f8d48913..a0ef2826 100644
--- a/trace/trace.go
+++ b/trace/trace.go
@@ -205,7 +205,7 @@ func (h *Hop) fetchIPData(c Config) (err error) {
 	if !c.AlwaysWaitRDNS {
 		select {
 		case <-fetchDoneChan:
-			// When fetch done signal recieved, stop waiting PTR record
+			// When fetch done signal received, stop waiting PTR record
 		case ptr := <-rDNSChan:
 			// process result
 			if err == nil && len(ptr) > 0 {
diff --git a/tracemap/tracemap.go b/tracemap/tracemap.go
index 16683269..3b3aab01 100644
--- a/tracemap/tracemap.go
+++ b/tracemap/tracemap.go
@@ -16,7 +16,7 @@ import (
 
 func GetMapUrl(r string) (string, error) {
 	host, port := util.GetHostAndPort()
-	fastIp := "origin-fallback.nxtrace.org"
+	var fastIp string
 	// 如果 host 是一个 IP 使用默认域名
 	if valid := net.ParseIP(host); valid != nil {
 		fastIp = host
diff --git a/util/util.go b/util/util.go
index d844b9f8..8a1623d2 100644
--- a/util/util.go
+++ b/util/util.go
@@ -208,7 +208,7 @@ func GetProxy() *url.URL {
 }
 
 func GetPowProvider() string {
-	var powProvider = ""
+	var powProvider string
 	if PowProviderParam == "" {
 		powProvider = GetenvDefault("NEXTTRACE_POWPROVIDER", "api.nxtrace.org")
 	} else {