Have upgraded to the latest Piwik release:
Piwik version: 3.1.1
MySQL version: 5.5.5
PHP version: 7.1.9
but when I visit the manage websites page it shows zero sites even though 13 are available. I have checked the NGINX error log on the server and it is showing:
2017/10/03 16:10:19 [alert] 7641#0: worker process 7676 exited on signal 6
terminate called after throwing an instance of 'std::out_of_range'
If I inspect the page I see an empty response from:
It's hard to say, but maybe a bug in PHP or so? Could you try another PHP version maybe?
I don't think this has anything to do with PHP. The error hints at
std::out_of_range and that is some C++ stuff so probably something on the NGINX side.
Can you check if you have a module like
ngx_pagespeed active? If so, could you check if deactivating it solves your problem?