diff --git a/server/imserver_new/cache/cachemgr.go b/server/imserver_new/cache/cachemgr.go
index 96523e75..89bf3e5b 100644
--- a/server/imserver_new/cache/cachemgr.go
+++ b/server/imserver_new/cache/cachemgr.go
@@ -3,7 +3,6 @@ package cache
 import (
 	"f5"
 	"q5"
-	"sync"
 	"fmt"
 	"main/common"
 	"main/constant"
@@ -15,7 +14,6 @@ type pendingUser struct {
 }
 
 type cacheMgr struct {
-	lock sync.Mutex
 	userHash map[string]*userProfile
 	pendingHash map[string]*pendingUser
 }