Module 'mapi' already loaded

Getting the following error message after installation from zip.
[2016-07-29 19:07:33] grav.CRITICAL: Module 'mapi' already loaded - Trace: #0
/var/www-baldev/grav/vendor/filp/whoops/src/Whoops/Run.php(363): Whoops\Run->handleError(32, 'Module 'mapi' a...', 'Unknown', 0) #1 [internal function]: Whoops\Run->handleShutdown() #2 {main} [] []

My Zarafa installation loads the mapi.so in php. How do I configure grav NOT to load the mapi extension?

Grav doesn't use mapi.so so I think this is a bad configuration problem on your server.