Why does my Laravel installation need prefixing \ backslash for facades aliases

I don't know the reason for malfunction of the following example:

Auth::user()->id 

However, just prefixing it with backslash makes it works fine:

\Auth::user()->id

This is a snippet from config/app.php

'aliases' => [

        'App' => Illuminate\Support\Facades\App::class,
        'Artisan' => Illuminate\Support\Facades\Artisan::class,
        'Auth' => Illuminate\Support\Facades\Auth::class,
        'Blade' => Illuminate\Support\Facades\Blade::class,
        'Broadcast' => Illuminate\Support\Facades\Broadcast::class,

The server is Apache on Ubuntu 16.04

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