diff --git a/lib/gfs.ts b/lib/gfs.ts
index a13f6275..270bdc51 100644
--- a/lib/gfs.ts
+++ b/lib/gfs.ts
@@ -38,7 +38,7 @@ export interface GfsDirStat extends GfsBaseStat {
 }
 
 function checkRsp(rsp: pb.Proto) {
-	if (rsp[1] === 0) return
+	if (!rsp[1]) return
 	drop(rsp[1], rsp[2])
 }
 
@@ -58,7 +58,10 @@ export class Gfs {
 		return this.c
 	}
 
-	constructor(private c: Client, public readonly gid: number) { }
+	constructor(private readonly c: Client, public readonly gid: number) {
+		common.lock(this, "c")
+		common.lock(this, "gid")
+	}
 
 	/** 获取使用空间和文件数 */
 	async df() {
diff --git a/package.json b/package.json
index 8e535edb..0a6e1895 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "oicq",
-  "version": "2.1.4",
-  "upday": "2021/11/07",
+  "version": "2.1.5",
+  "upday": "2021/12/04",
   "description": "QQ protocol!",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",