diff --git a/electron/hwidUtil.js b/electron/hwidUtil.js
index 285ff88..e1e6055 100644
--- a/electron/hwidUtil.js
+++ b/electron/hwidUtil.js
@@ -16,17 +16,21 @@ const platforms = {
 };
 const crypto = require("crypto");
 
+const defaultHWID = "recorderinthesandybridge";
+
 /**
  * Returns machine hardware id.
  * Returns `undefined` if cannot determine.
- * @return {string?}
+ * @return {Promise<string>}
  */
 function getHwId() {
-  const getter = platforms[process.platform];
-  if (!getter) return;
-  const result = getter[1].exec(child_process.execSync(getter[0], options));
-  if (!result) return;
-  return crypto.createHash("md5").update(result[1]).digest("hex") ||
-    undefined;
+  return new Promise((resolve) => {
+    const getter = platforms[process.platform];
+    if (getter) {
+      const result = getter[1].exec(child_process.execSync(getter[0], options));
+      if (result) resolve(crypto.createHash("md5").update(result[1]).digest("hex"));
+    }
+    resolve(crypto.createHash("md5").update(defaultHWID).digest("hex"));
+  })
 }
 exports.getHwId = getHwId;
diff --git a/main.js b/main.js
index b50f05b..ea3dd75 100644
--- a/main.js
+++ b/main.js
@@ -248,7 +248,7 @@ function registerIPCPipes() {
   ipcMain.handle("ezpplauncher:login", async (e, args) => {
     let hwid = "";
     try {
-      hwid = getHwId();
+      hwid = await getHwId();
     } catch (err) {
       logger.error(`Failed to get HWID.`, err);
       return {
@@ -315,7 +315,7 @@ function registerIPCPipes() {
   });
 
   ipcMain.handle("ezpplauncher:autologin", async (e) => {
-    const hwid = getHwId();
+    const hwid = await getHwId();
     const username = config.get("username");
     const guest = config.get("guest");
     if (guest) return { code: 200, message: "Login as guest", guest: true };