diff --git a/README.md b/README.md
index 66abc883..8ec7ecfc 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,8 @@ Beego is compos of four parts:
 3. Client: including ORM module, httplib module, cache module;
 4. Server: including web module. We will support gRPC in the future;
 
+**Please use RELEASE version, or master branch which contains the latest bug fix**
+
 ## Quick Start
 
 [Officail website](http://beego.me)
diff --git a/client/cache/ssdb/ssdb_test.go b/client/cache/ssdb/ssdb_test.go
index bdca1902..e08ed573 100644
--- a/client/cache/ssdb/ssdb_test.go
+++ b/client/cache/ssdb/ssdb_test.go
@@ -60,7 +60,7 @@ func TestSsdbcacheCache(t *testing.T) {
 	assert.Equal(t, 3, v)
 	assert.Nil(t, err)
 
-	assert.NotNil(t, ssdb.Delete(context.Background(), "ssdb"))
+	assert.Nil(t, ssdb.Delete(context.Background(), "ssdb"))
 	assert.Nil(t, ssdb.Put(context.Background(), "ssdb", "ssdb", -10*time.Second))
 	// test string
 
diff --git a/core/logs/log_msg.go b/core/logs/log_msg.go
index f96fa72f..f1a0b559 100644
--- a/core/logs/log_msg.go
+++ b/core/logs/log_msg.go
@@ -37,7 +37,7 @@ func (lm *LogMsg) OldStyleFormat() string {
 	msg := lm.Msg
 
 	if len(lm.Args) > 0 {
-		lm.Msg = fmt.Sprintf(lm.Msg, lm.Args...)
+		msg = fmt.Sprintf(lm.Msg, lm.Args...)
 	}
 
 	msg = lm.Prefix + " " + msg
diff --git a/core/logs/log_msg_test.go b/core/logs/log_msg_test.go
index f213ed42..dcc7e7d4 100644
--- a/core/logs/log_msg_test.go
+++ b/core/logs/log_msg_test.go
@@ -41,4 +41,8 @@ func TestLogMsg_OldStyleFormat(t *testing.T) {
 
 	res = lg.OldStyleFormat()
 	assert.Equal(t, "[D] [/user/home/main.go:13] Cus Hello, world", res)
+
+	lg.Msg = "hello, %s"
+	lg.Args = []interface{}{"world"}
+	assert.Equal(t, "[D] [/user/home/main.go:13] Cus hello, world", lg.OldStyleFormat())
 }
diff --git a/core/logs/log_test.go b/core/logs/log_test.go
index 66f59108..d7728c76 100644
--- a/core/logs/log_test.go
+++ b/core/logs/log_test.go
@@ -18,9 +18,10 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+
 )
 
-func TestBeeLogger_DelLogger(t *testing.T) {
+func TestBeeLoggerDelLogger(t *testing.T) {
 	prefix := "My-Cus"
 	l := GetLogger(prefix)
 	assert.NotNil(t, l)