From the apache error log
[Thu Oct 19 19:58:47.876786 2017] [:error] [pid 14391] [client 87.43.255.12:46976] #6 /usr/share/egroupware/api/src/Etemplate/Widget/Nextmatch.php(696): EGroupware\Api\Etemplate\Widget\Nextmatch::get_timestamps(), referer: https://www.scins.ie/egw/index.php?cd=yes
[Thu Oct 19 19:58:47.876790 2017] [:error] [pid 14391] [client 87.43.255.12:46976] #7 /usr/share/egroupware/api/src/Etemplate/Widget/Nextmatch.php(661): EGroupware\Api\Etemplate\Widget\Nextmatch::run_beforeSendToClient(Array), referer: https://www.scins.ie/egw/index.php?cd=yes
[Thu Oct 19 19:58:47.876795 2017] [:error] [pid 14391] [client 87.43.255.12:46976] #8 /usr/share/egroupware/api/src/Etemplate/Widget/Nextmatch.php(363): EGroupware\Api\Etemplate\Widget\Nextmatch::call_get_rows(Array, Array, Array, Object(calendar_uilist), ‘get_rows’, NULL), referer: https://www.scins.ie/egw/index.php?cd=yes
[Thu Oct 19 19:58:47.876799 2017] [:error] [pid 14391] [client 87.43.255.12:46976] #9 [internal function]: EGroupware\Api\Etemplate\Widget\Nextmatch::ajax_get_rows(‘calendar_ghooto…’, Array, Array, NULL, Array, 1508439490), referer: https://www.scins.ie/egw/index.php?cd=yes
[Thu Oct 19 19:58:47.876804 2017] [:error] [pid 14391] [client 87.43.255.12:46976] #10 /usr/share/egroupware/api/src/Json/Request.php(179): call_user_func_array(Array, Array), referer: https://www.scins.ie/egw/index.php?cd=yes
[Thu Oct 19 19:58:47.876808 2017] [:error] [pid 14391] [client 87.43.255.12:46976] #11 /usr/share/egroupware/api/src/Json/Request.php(91): EGroupware\Api\Json\Request->handleRequest(‘EGroupware\\Api\\…’, Array), referer: https://www.scins.ie/egw/index.php?cd=yes
[Thu Oct 19 19:58:47.876812 2017] [:error] [pid 14391] [client 87.43.255.12:46976] #12 /usr/share/egroupware/json.php(119): EGroupware\Api\Json\Request->parseRequest(‘EGroupware\\Api\\…’, ‘{“request”:{"pa…’), referer: https://www.scins.ie/egw/index.php?cd=yes
[Thu Oct 19 19:58:47.876817 2017] [:error] [pid 14391] [client 87.43.255.12:46976] #13 {main}, referer: https://www.scins.ie/egw/index.php?cd=yes
[Thu Oct 19 19:58:47.876825 2017] [:error] [pid 14391] [client 87.43.255.12:46976] # Instance=New, User=ghooton, Request=POST https://www.scins.ie/egw/json.php?menuaction=EGroupware\Api\Etemplate\Widget\Nextmatch::ajax_get_rows, User-agent=Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:56.0) Gecko/20100101 Firefox/56.0, referer: https://www.scins.ie/egw/index.php?cd=yes