Admin toolbar shows up when not logged in

Apparently the W3 Total Cache plugin caused this problem. I tried removing the toolbar via CSS by using display:none;. When this didn’t worked, I found that the CSS that styled the toolbar was in one of the cache folders of this plugin.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)