Trying to get property of non-object in Laravel 5

Hi im a beginner in laravel. I am receiving an error Trying to get property of non-object. Please help me out. Thanks in advance!

Below are my routes

use App\Post;
use App\User;

Route::get('/user/{id}/post', function($id){
    $post = User::find(1)->post;
});

Below are my users

public function post(){
        return $this->hasOne('App/Post');
    }

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