diff --git a/src/server/pkg/github.com/name5566/leaf/log/log.go b/src/server/pkg/github.com/name5566/leaf/log/log.go
index 44f7db4b..8c6ab230 100644
--- a/src/server/pkg/github.com/name5566/leaf/log/log.go
+++ b/src/server/pkg/github.com/name5566/leaf/log/log.go
@@ -27,7 +27,6 @@ const (
 )
 
 type Logger struct {
-	lock       sync.Mutex
 	level      int
 	baseLogger *log.Logger
 	baseFile   *os.File
@@ -219,24 +218,36 @@ func Export(logger *Logger) {
 func Debug(format string, a ...interface{}) {
 	gloggerLock.Lock()
 	defer gloggerLock.Unlock()
+	if gLogger == nil {
+		return
+	}
 	gLogger.doPrintf(debugLevel, printDebugLevel, format, a...)
 }
 
 func Release(format string, a ...interface{}) {
 	gloggerLock.Lock()
 	defer gloggerLock.Unlock()
+	if gLogger == nil {
+		return
+	}
 	gLogger.doPrintf(releaseLevel, printReleaseLevel, format, a...)
 }
 
 func Error(format string, a ...interface{}) {
 	gloggerLock.Lock()
 	defer gloggerLock.Unlock()
+	if gLogger == nil {
+		return
+	}
 	gLogger.doPrintf(errorLevel, printErrorLevel, format, a...)
 }
 
 func Fatal(format string, a ...interface{}) {
 	gloggerLock.Lock()
 	defer gloggerLock.Unlock()
+	if gLogger == nil {
+		return
+	}
 	gLogger.doPrintf(fatalLevel, printFatalLevel, format, a...)
 }