Hello everyone. Can someone help me with this error. I upgraded to php7.2 and updated all modules and site but can't solve this problem.
ubuntu 16.04 lts
apache2
http2 protocol
joomla 3.8.13
jomsocial 4.5.9
gkquark template
Got error 'PHP message: PHP Notice: Undefined property: stdClass::$browserNav in /var/www/html/metroarizona.com/components/com_community/templates/jomsocial/layouts/toolbar/base.php on line 136\nPHP message: PHP Notice: Undefined property: stdClass::$browserNav in /var/www/html/metroarizona.com/components/com_community/templates/jomsocial/layouts/toolbar/base.php on line 138\n', referer: https://metroarizona.com/index.php/login-signup/my-account/notifications
[Thu Oct 18 18:25:33.674592 2018] [proxy_fcgi:error] [pid 12015:tid 139740201346816] [client 70.175.106.238:50146] AH01071: Got error 'PHP message: PHP Notice: Undefined property: stdClass::$browserNav in /var/www/html/metroarizona.com/components/com_community/templates/jomsocial/layouts/toolbar/base.php on line 136\nPHP message: PHP Notice: Undefined property: stdClass::$browserNav in /var/www/html/metroarizona.com/components/com_community/templates/jomsocial/layouts/toolbar/base.php on line 138\n', referer: https://metroarizona.com/index.php/login-signup/my-account/79-james-manley-jr/app?app=dtreg_records
[Thu Oct 18 18:29:36.621065 2018] [proxy_fcgi:error] [pid 11902:tid 139740117337856] [client 70.175.106.238:50189] AH01071: Got error 'PHP message: PHP Notice: Only variables should be assigned by reference in /var/www/html/metroarizona.com/administrator/components/com_community/controllers/configuration.php on line 144\nPHP message: PHP Notice: Undefined index: network_keywords in /var/www/html/metroarizona.com/administrator/components/com_community/models/network.php on line 173\n', referer: https://metroarizona.com/administrator/index.php?

any ideas?