Laravel Logging Via Slack

Question

My config logging file is:

'channels' => [
    'stack' => [
        'driver' => 'stack',
        'channels' => ['daily', 'slack'],
    ],

    'daily' => [
        'driver' => 'daily',
        'path' => storage_path('logs/laravel.log'),
        'level' => 'debug',
        'days' => 7,
    ],

    'slack' => [
        'driver' => 'slack',
        'url' => env('LOG_SLACK_WEBHOOK_URL'),
        'emoji' => ':information_source:',
        'level' => 'error',
    ],

Also I set my env('LOG_SLACK_WEBHOOK_URL') in the .env file. I don't set anythings else.

Everything works perfectly, but when errors occurred in my Laravel application, two of the same error message create in slack channel.

I am using Laravel 5.6.