mortydot on "[Plugin: W3 Total Cache] database caching error help"

Hi,

When enabling database caching, we get this PHP error in the logs.

[Thu Feb 06 09:59:57.435464 2014] [:error] [pid 21102:tid 2859146128] [client 111.111.111.111:57373] PHP Fatal error: Call to a member function query() on a non-object in /home/user/domains/domain.nl/public_html/wp-content/plugins/w3-total-cache/lib/W3/Db.php on line 95, referer: http://testtest.domain.nl/wp-admin/admin.php?page=mailpress_write

I understand that w3tch has a problem. But how do i now wich line in mailpress_write is causing this problem?

Any suggestions?

https://wordpress.org/plugins/w3-total-cache/