diff --git a/lib/package.js b/lib/package.js
index a352fa3..6875b58 100644
--- a/lib/package.js
+++ b/lib/package.js
@@ -69,8 +69,6 @@ const appdata = commonTools.appdata;
         this.excludeFiles = [];
         this.sign = null;
         this.certificate = null;
-        this.sign = "";
-        this.certificate = "";
         this.appCount = 0;
         this.services = [];
         this.pkgServiceNames = [];
@@ -1506,7 +1504,7 @@ const appdata = commonTools.appdata;
                 let controlSigner = crypto.createSign('sha256')
                 controlSigner.update(controlData);
                 controlSigner.end();
-                controlSign = controlSigner.sign(privateKey);
+                const controlSign = controlSigner.sign(privateKey);
                 let base64data = Buffer.from(controlSign).toString('base64');
                 
                 fs.writeFile(controlSignFilePath, base64data, next);