Notice: Undefined index: extdisplay in admin/modules/languages/functions.inc.php on line 277

I recently installed FreePBX 2.7 and originally I had PHP errors turned off, but I was writing my own custom PHP and needed to debug so I turned it on, and now when I click on the Inbound Route option in FreePBX I get the error below across the top

Notice: Undefined index: extdisplay in /var/www/html/admin/modules/languages/functions.inc.php on line 277

From what I can tell its trying to get extdisplay which is a variable passed in the URL, ie once you click a route in the inbound route section the error goes away because the link includes extdisplay= and then the extension

This error is only visible when the Languages module is installed, so far it doesn't seem to have caused any major issues and is purely a cosmetic thing at this time