diff --git a/app/Http/Controllers/Callback/LinkosCallbackController.php b/app/Http/Controllers/Callback/LinkosCallbackController.php
index e7f6f4a..6fcfa2a 100644
--- a/app/Http/Controllers/Callback/LinkosCallbackController.php
+++ b/app/Http/Controllers/Callback/LinkosCallbackController.php
@@ -11,7 +11,11 @@ class LinkosCallbackController extends Controller
     public function __invoke(Request $request)
     {
         if ($request->filled('notify_type')) {
-            $this->handleDeviceStateNotify($request);
+            switch ($request->notify_type) {
+                case 'online_state_change':
+                    $this->handleDeviceStateNotify($request);
+                    break;
+            }
         }
 
         return response()->json(['code' => 0, 'msg' => 'ok']);
@@ -22,25 +26,31 @@ class LinkosCallbackController extends Controller
      */
     protected function handleDeviceStateNotify(Request $request): void
     {
-        if ($request->notify_type !== 'online_state_change') {
-            return;
-        }
-
         foreach ($request->input('data', []) as $item) {
-            if (is_null($device = Device::where('sn', $item['device_id'])->first())) {
+            if (! isset($item['device_id'])) {
                 continue;
             }
 
-            if ($request->filled('online_state')) {
-                $state = match ((int) $request->online_state) {
-                    0 => Device::STATE_OFFLINE,
-                    1 => Device::STATE_ONLINE,
-                    default => $device->state,
-                };
+            $device = Device::where('sn', $item['device_id'])->first();
 
-                $device->forceFill([
-                    'state' => $state,
-                ])->save();
+            if ($device === null) {
+                continue;
+            }
+
+            if (isset($item['online_state'])) {
+                switch ($item['online_state']) {
+                    case 0:
+                        $device->forceFill([
+                            'state' => Device::STATE_OFFLINE,
+                        ])->save();
+                        break;
+
+                    case 1:
+                        $device->forceFill([
+                            'state' => Device::STATE_ONLINE,
+                        ])->save();
+                        break;
+                }
             }
         }
     }