diff --git a/world.go b/world.go
index 959b0bf..230e3d6 100644
--- a/world.go
+++ b/world.go
@@ -214,8 +214,10 @@ func (w *world) Close() {
 		w.updateState(WorldClosed)
 		return
 	}
-	w.cancel()
-	<-w.done
+	if w.cancel != nil {
+		w.cancel()
+		<-w.done
+	}
 }
 
 // 执行待处理方法