diff --git a/services/timer/src/timer_manager.cpp b/services/timer/src/timer_manager.cpp
index 35aa98fa4808785cc7beae44385e9cf8d97ec3c2..fd67fa99c4ff11dda0b6cf0b58b533102412d1a4 100644
--- a/services/timer/src/timer_manager.cpp
+++ b/services/timer/src/timer_manager.cpp
@@ -1222,7 +1222,7 @@ void TimerManager::DecRunningLockRef()
         count_ -= 1;
     }
     TIME_HILOGI(TIME_MODULE_SERVICE, "count_=%{public}d", count_);
-    if (count_ == 0) {
+    if (count_ == 0 && runningLock_ != nullptr) {
         runningLock_->UnLock();
         TIME_HILOGI(TIME_MODULE_SERVICE, "runninglock unlock");
     }