change login code for auth

app/Http/Controllers/AuthController.php

@@ -17,28 +17,28 @@ class AuthController extends Controller
 
     public function login(LoginRequest $request): JsonResponse
     {
-        $inputTelephoneId = $request->input('telephone_id');
-
         $user = User::where('username', $request->username)->first();
+        $telephoneId = $user->telephone_id;
 
-        if ($user->is_online && !empty($user->telephone_id)) {
-            return $this->errorResponse(__('messages.user_already_online'), 409); // 409 Conflict
+        if ($user->is_online) {
+            return $this->errorResponse(__('messages.user_already_online'), 409);
 
         }
-        if (!empty($inputTelephoneId)) {
-            $previousUserOnThisSystem = User::where('telephone_id', $inputTelephoneId)
+
+        if ($telephoneId) {
+            $previousOfflineUser = User::where('telephone_id', $telephoneId)
+                ->where('id', '!=', $user->id)
                 ->where('is_online', false)
                 ->first();
 
-            if ($previousUserOnThisSystem) {
+            if ($previousOfflineUser) {
                 DB::table('sessions')
-                    ->where('user_id', $previousUserOnThisSystem->id)
+                    ->where('user_id', $previousOfflineUser->id)
                     ->delete();
             }
         }
 
-
-            if ($this->attemptLogin($request))
+        if ($this->attemptLogin($request))
         {
             $request->session()->regenerate();
             $this->updateUserInfo($request);