I'm getting a lot of following errors:

2014/03/29 07:24:40 [error] 30886#0: *112 FastCGI sent in stderr: "PHP message: PHP Warning:  Invalid argument supplied for foreach() in /home/.../public_html/.../public/wp-content/plugins/sociallocker-next-premium/admin/pages/common-settings.php on line 290" while reading response header from upstream, client: 81.xxx.xxx.xxx, server: www.xxx.xxx, request: "POST /wp-admin/edit.php?post_type=social-locker&page=common-settings-sociallocker-next HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "www.xxx.xxx", referrer: "https://www.xxx.xxx/wp-admin/edit.php?post_type=social-locker&page=common-settings-sociallocker-next"

What could be wrong? I'm running a LEMP installation with Wordpress.

It sounds like an invalid argument is being supplied for foreach() on line 290 of that common-settings.php file.

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The WordPress plugin SocialLocker Next Premium probably does a poor job checking for the contents of an array in its settings. If you don't need the plugin, disable it. If you do need it…well, have you finished setting it up?