diff --git a/server/routes/device.js b/server/routes/device.js
index a0143ff..b72ff1b 100644
--- a/server/routes/device.js
+++ b/server/routes/device.js
@@ -406,8 +406,10 @@ router.put('/:id', authenticateToken, validateRequest(updateDeviceSchema), async
 
     await device.update(req.body);
 
-    // Emit real-time update
-    req.io.emit('device_updated', device);
+    // Emit real-time update (only if io is available)
+    if (req.io) {
+      req.io.emit('device_updated', device);
+    }
 
     console.log(`✅ Device ${req.params.id} updated successfully`);