diff --git a/utils/timer/options.go b/utils/timer/options.go
index ea8fb60..255f8c6 100644
--- a/utils/timer/options.go
+++ b/utils/timer/options.go
@@ -3,9 +3,11 @@ package timer
 type Option func(ticker *Ticker)
 
 // WithCaller 通过其他的 handler 执行 Caller
-func WithCaller(handle func(name string, caller func())) Option {
+func WithCaller(handler func(name string, caller func())) Option {
 	return func(ticker *Ticker) {
-		ticker.handler = handle
+		ticker.lock.Lock()
+		ticker.handler = handler
+		ticker.lock.Unlock()
 	}
 }
 
diff --git a/utils/timer/ticker.go b/utils/timer/ticker.go
index ebae57e..c739a12 100644
--- a/utils/timer/ticker.go
+++ b/utils/timer/ticker.go
@@ -150,7 +150,11 @@ func (slf *Ticker) loop(name string, after, interval time.Duration, expr *cronex
 	slf.timers[name] = scheduler
 	if slf.handler != nil {
 		scheduler.timer = slf.wheel.ScheduleFunc(scheduler, func() {
-			slf.handler(scheduler.Name(), scheduler.Caller)
+			slf.lock.RLock()
+			defer slf.lock.RUnlock()
+			if slf.handler != nil {
+				slf.handler(scheduler.Name(), scheduler.Caller)
+			}
 		})
 	} else {
 		scheduler.timer = slf.wheel.ScheduleFunc(scheduler, scheduler.Caller)