diff --git a/backend/workerRoutes.js b/backend/workerRoutes.js
index 1a33fa8..484d7af 100644
--- a/backend/workerRoutes.js
+++ b/backend/workerRoutes.js
@@ -46,7 +46,7 @@ export default function(db) {
     // Check if worker has device_uuid (Android device)
     if (user.role === 'worker') {
         const [deviceRows] = await db.execute('SELECT device_uuid FROM workers WHERE id = ?', [user.id]);
-        if (deviceRows[0].device_uuid) {
+        if (deviceRows[0].device_uuid&&deviceRows[0].device_uuid.length){
           return res.status(403).json({ message: 'useMobileApp' });
         }
     }