I get the following error messages:
[01-Nov-2019 09:00:07 UTC] PHP Notice: Undefined variable: post in /mnt/web417/a2/76/52551976/htdocs/wp-content/plugins/gp-premium/hooks/functions/hooks.php(22) : eval()'d code on line 8
[01-Nov-2019 09:00:07 UTC] PHP Notice: Trying to get property 'ID' of non-object in /mnt/web417/a2/76/52551976/htdocs/wp-content/plugins/gp-premium/hooks/functions/hooks.php(22) : eval()'d code on line 8
[01-Nov-2019 09:00:07 UTC] PHP Notice: Undefined variable: post in /mnt/web417/a2/76/52551976/htdocs/wp-content/plugins/gp-premium/hooks/functions/hooks.php(22) : eval()'d code on line 20
[01-Nov-2019 09:00:07 UTC] PHP Notice: Trying to get property 'ID' of non-object in /mnt/web417/a2/76/52551976/htdocs/wp-content/plugins/gp-premium/hooks/functions/hooks.php(22) : eval()'d code on line 20
What might be the reason?