Laravel, When Database Is Empty I'm Getting Error Otherwise Not But I Have To Use This

        $employee = Employee::where('user_id', Auth::user()->id)->get();

            foreach (Company::all() as $company)
                {
                    if ($company->id == $employee[0]->company_id && $company->employee_active === 1)
                    {
                        $event->menu->add([
                            'text'        => 'Contracten',
                            'url'         => 'dashboard/contracts',
                            'icon'        => 'file-text',
                            'submenu' => [
                                [
                                    'text' => 'Contract opzetten',
                                    'url'  => 'dashboard/contracts/create',
                                    'icon_color' => 'red',
                                ]
                            ]
                        ]);
                    }
                }

When I use this code I'm getting undefined offset: 0, if the database is empty. How can get this write? Should I use an if or something like that

Really you should configure your relationships correctly so that you can do

$companies = Company::all();

foreach($companies as $company){

    foreach($company->employees as $employee){

        if($employee->active){
          ....
        }   

    }

}

But in your case you can change your first line to

 $employee = Employee::where('user_id', Auth::user()->id)->first();

Which will return an Employee object collection rather than an array so you don't need to use an [index] to get the first object.