Undefined index: classes at /apps/files/templates/appnavigation.php

[rullzer]

{
   "reqId":"iVxCQKfptYi3Ew3gndq4",
   "level":3,
   "time":"2018-07-26T15:00:01+02:00",
   "remoteAddr":"192.168.2.1",
   "user":"roeland",
   "app":"PHP",
   "method":"GET",
   "url":"\/apps\/files\/",
   "message":"Undefined index: classes at apps\/files\/templates\/appnavigation.php#67",
   "userAgent":"Mozilla\/5.0 (X11; Linux x86_64; rv:61.0) Gecko\/20100101 Firefox\/61.0",
   "version":"14.0.0.13"
}

[MorrisJobke]

Fix is in #10406

[nextcloud-bot]

GitMate.io thinks possibly related issues are #9529 (Template file), #2580 (Undefined class constant 'INTERPOLATE_BICUBIC'), #5059 (Undefined index: federationId), #2257 (Undefined index: file at /apps/files_sharing/lib/Activity/Providers/Downloads.php#123 ), and #528 (Restore a file from trashbin -> Undefined index: files at cloud/apps/files_trashbin/ajax/undelete.php#31).