Не могу получить JSON данные, 500 Internal Server Error

Пытаюсь вернуть JSON ответ, но при попытке получения, выдает

"500 Internal Server Error".

Сайт лежит на vps хостиге. На локальном сервере php bin/console server:run все работает прекрасно.
Сайт на Symfony3 c использование FOSUBundle.

В логе пишет

"GET /admin/posts HTTP/1.1" 500 507

Конфиг nginx:

user nginx;
worker_processes 1;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
include /usr/share/nginx/modules/*.conf;
events {
    worker_connections 1024;
}
http {
    server_names_hash_bucket_size 64;
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
    access_log  /var/log/nginx/access.log  main;
    gzip        on;
    gzip_comp_level 9;
    gzip_types          text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript image/svg+xml application/x-font-ttf font/opentype;
    gzip_proxied        any;
    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;
    proxy_redirect      off;
    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;
    include /etc/nginx/conf.d/*.conf;
    server {
        listen       80 default_server;
        server_name  144645.simplecloud.club;
        root /var/www/site/web;
    location / {
    try_files $uri /app.php$is_args$args;
    }
    location ~ ^/app\.php(/|$) {
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_split_path_info ^(.+\.php)(/.*)$;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;
        fastcgi_param DOCUMENT_ROOT $realpath_root;
        internal;
    }
    location ~ \.php$ {
        return 404;
    }
    error_log /var/log/nginx/project_error.log;
    access_log /var/log/nginx/project_access.log;
}