diff --git a/timer.go b/timer.go
index 2f15c0c..b2a7f8b 100644
--- a/timer.go
+++ b/timer.go
@@ -17,6 +17,7 @@ type Timer struct {
 }
 
 func (this *Timer) init() {
+	this.timer = new(q5.XTimer)
 	this.timer.Init(
 		func (context interface{}) int64 {
 			return q5.GetTickCount()
@@ -32,6 +33,7 @@ func (this *Timer) update() {
 
 func (this *Timer) unInit() {
 	this.timer.UnInit()
+	this.timer = nil
 }
 
 func (this *Timer) NewTimerAttacher() *TimerAttacher {