[otrs] Logout issue

Hello, Every time when I log out I get this error on the page: ------------------------------------------------------- 502 Bad Gateway The server returned an invalid or incomplete response. ------------------------------------------------------- I have to then refresh the page again in order for it to take me back to log in page and when I refresh the page it says "Invalid SessionID!" in red on top of the page. I also noticed if I leave the page without refreshing a second time it gets stuck on the 502 error above unless I go to index.pl?Action=Logout a second time. How do I fix this? I am using otrs-2.1.7-39. Thanks, - Jake