diff --git a/internal/watcher/health/monitor/monitor.go b/internal/watcher/health/monitor/monitor.go
index 6023ad35..7817d73d 100644
--- a/internal/watcher/health/monitor/monitor.go
+++ b/internal/watcher/health/monitor/monitor.go
@@ -174,7 +174,9 @@ func (mon *monitor) Task() *task.Task {
 
 // Finish implements task.TaskFinisher.
 func (mon *monitor) Finish(reason any) {
-	mon.task.Finish(reason)
+	if mon.task != nil {
+		mon.task.Finish(reason)
+	}
 }
 
 // UpdateURL implements HealthChecker.