diff --git a/src/main/java/net/lamgc/cgj/bot/framework/mirai/MiraiMain.java b/src/main/java/net/lamgc/cgj/bot/framework/mirai/MiraiMain.java
index d8df389..b16a694 100644
--- a/src/main/java/net/lamgc/cgj/bot/framework/mirai/MiraiMain.java
+++ b/src/main/java/net/lamgc/cgj/bot/framework/mirai/MiraiMain.java
@@ -73,9 +73,16 @@ public class MiraiMain implements Closeable {
         BotEventHandler.executeMessageEvent(new MiraiMessageEvent(message));
     }
 
+    /**
+     * 关闭机器人
+     */
     public void close() {
+        if(bot == null) {
+            return;
+        }
         log.warn("正在关闭机器人...");
         bot.close(null);
+        bot = null;
         log.warn("机器人已关闭.");
     }