TypeError: Illuminate\Auth\SessionGuard::login(): Argument #1 ($user) must be of type Illuminate\Contracts\Auth\Authenticatable,, App\Models\Admin giv
Stefan Bogdanescu
Founder & Senior Architect · 2026-06-29
Title: Fixing TypeError in Laravel App for Admin Login Authentication
When developing a Laravel application with multi-authorization support, you might encounter issues related to authentication errors. If you're experiencing a TypeError during login specifically for your admin area, it is likely due to incorrect argument types being passed into the session guard login method. In this blog post, we will explore why this occurs and provide solutions to resolve these problems.
The original issue you mentioned in your code refers to the Illuminate\Auth\SessionGuard::login() method requiring an argument of type Illuminate\Contracts\Auth\Authenticatable for its first input parameter. The model used in your code (App\Models\Admin) seems to be causing this conflict since it does not directly implement that interface.
To resolve this problem, we can modify the Admin model by updating its structure and adding a proper implementation of Illuminate\Contracts\Auth\Authenticatable interface:
1. Add the required interfaces in your App\Models\Admin class. Ensure it includes Authenticatable as well as any other relevant contracts (such as MustVerifyEmail or MustBeVerified) if needed, depending on your application's requirements.
```php
namespace App\Models;
use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Foundation\Auth\User as Authenticatable;
class Admin extends Authenticatable implements MustVerifyEmail
{
// Rest of the code...
}
```
2. Update your controller code to ensure the correct model type is used when authenticating users:
```php
namespace App\Http\Controllers;
use App\Models\Admin;
// Other imports...
class AdminController extends Controller
{
public function authenticate(Request $request)
{
/** @var Admin $model */
$model = Admin::query()
->where('email', $request->get('email'))
->firstOrFail(); // Note: Use firstOrFail() instead of first()
if(!$model){
return back()
->with('error', 'Email or password is incorrect');
}
if (!Hash::check($request->get('password'), $model->password)) {
return back()
->with('error', 'Email or password is incorrect');
}
// Correct login implementation using the updated model and interface:
Auth::guard('admin')->login($model);
return redirect()->route('dashboard')
->with('success', 'Welcome ' . $model->name . '!');
}
}
```
3. Verify that the correct authentication guards are set for your admin area in the auth configuration file: config/auth.php
```php
[
'admin' => [
'driver' => 'session',
'provider' => 'admins',
],
],
// Your existing guards and providers...
];
```
This will ensure that the admin controller is using the correct authentication guard (which should be 'admin').
These steps should fix your TypeError issue in Laravel Admin login. If you still encounter problems, it's recommended to ensure that all required interfaces are properly implemented and used throughout the application. Remember that proper error handling and logging can also aid in troubleshooting authentication errors in Laravel applications.