An error has occurred

PHP NOTICE [8] ob_end_clean() [<a href='http://php.net/manual/en/ref.outcontrol.php'>ref.outcontrol.php</a>]: failed to discard buffer of zlib output compression (0) in sources/global2.php on line 1856 (version: 10.0.7, PHP version: 7.0.18-0ubuntu0.16.04.1, URL: /chat/blocking_interface)

The staff have been provided a ‘stack trace’ which may help them diagnose the problem.