diff --git a/.travis.yml b/.travis.yml
index 816f4c1..911b641 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,4 +4,5 @@ go:
   - 1.12.x
 
 script:
+  - make vet
   - make test
diff --git a/Makefile b/Makefile
index 6acf096..82dab6a 100644
--- a/Makefile
+++ b/Makefile
@@ -22,6 +22,9 @@ build:
 	go build -mod=vendor -o bin/ledis-load -tags '$(GO_BUILD_TAGS)' cmd/ledis-load/*
 	go build -mod=vendor -o bin/ledis-repair -tags '$(GO_BUILD_TAGS)' cmd/ledis-repair/*
 
+vet:
+	go vet -mod=vendor -tags '$(GO_BUILD_TAGS)' ./...
+
 test:
 	go test -mod=vendor --race -tags '$(GO_BUILD_TAGS)' -timeout 2m $$(go list ./... | grep -v -e /vendor/)
 
diff --git a/cmd/ledis-benchmark/main.go b/cmd/ledis-benchmark/main.go
index 06e2b61..8b14ee0 100644
--- a/cmd/ledis-benchmark/main.go
+++ b/cmd/ledis-benchmark/main.go
@@ -258,12 +258,10 @@ func main() {
 
 	if *number <= 0 {
 		panic("invalid number")
-		return
 	}
 
 	if *clients <= 0 || *number < *clients {
 		panic("invalid client number")
-		return
 	}
 
 	loop = *number / *clients
diff --git a/config/config.go b/config/config.go
index 31652be..cf91de5 100644
--- a/config/config.go
+++ b/config/config.go
@@ -100,7 +100,7 @@ type TLS struct {
 type AuthMethod func(c *Config, password string) bool
 
 type Config struct {
-	m sync.RWMutex `toml:"-"`
+	m *sync.RWMutex `toml:"-"`
 
 	AuthPassword string `toml:"auth_password"`
 
@@ -179,6 +179,7 @@ func NewConfigWithData(data []byte) (*Config, error) {
 
 func NewConfigDefault() *Config {
 	cfg := new(Config)
+	cfg.m = new(sync.RWMutex)
 
 	cfg.Addr = DefaultAddr
 	cfg.HttpAddr = ""
diff --git a/server/replication.go b/server/replication.go
index 911488c..6d3064e 100644
--- a/server/replication.go
+++ b/server/replication.go
@@ -241,8 +241,6 @@ func (m *master) runReplication(restart bool) {
 			}
 		}
 	}
-
-	return
 }
 
 func (m *master) replConf() error {
diff --git a/store/goleveldb/db.go b/store/goleveldb/db.go
index 1afc32f..c1c8517 100644
--- a/store/goleveldb/db.go
+++ b/store/goleveldb/db.go
@@ -195,7 +195,10 @@ func (db *DB) NewSnapshot() (driver.ISnapshot, error) {
 }
 
 func (db *DB) Compact() error {
-	return db.db.CompactRange(util.Range{nil, nil})
+	return db.db.CompactRange(util.Range{
+		Start: nil,
+		Limit: nil,
+	})
 }
 
 func init() {