Error when trying to load page

I get the following fatal error when trying to load my webpage. If I load the page in an incognito window it loads fine.

Fatal error: Cannot use object of type WP_Error as array in /home4/kevin22/public_html/ on line 44

Can you clear your cookies (all) for your website and test it from your non-incognito window again?

if that doesnt work, please prepare me an admin account (a new one) with a sufficiently complex password and mail it to me at so i can debug on-site.