Laravel Homestead提供502 Bad Gateway错误而不是laravel错误页面

Question

I've noticed an interesting behavior on laravel homestead.

The specifications:

Laravel 4.2

nginx/1.8.0

PHP 5.6.9-1+deb.sury.org~utopic+2 (fpm-fcgi) (built: May 24 2015 16:16:14) Copyright (c) 1997-2015 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2015 Zend Technologies with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2015, by Zend Technologies with Xdebug v2.3.2, Copyright (c) 2002-2015, by Derick Rethans with blackfire v0.23.3, https://blackfire.io/, by SensioLabs

on model.blade.php page 502 Bad Gateway error with undefined variable:

var_dump($publicationsss);

Works fine with defined variable:

var_dump($publications);

I want to see a laravel error page instead of nginx error message. What should i do ?

Error Log Message:

2015/05/30 21:27:23 [error] 20048#0: *307 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 192.168.10.1, server: api.weakapi.dev, request: "GET /panel/banner/edit/link/16 HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "api.weakapi.dev"