[Owncloud] Undefined index: mimetype

[Johan Hendriks]

After I update to 4.5.3 i see the following lines appear in my error logs.

PHP Notice:  Undefined index: mimetype in 
/usr/local/www/owncloud/lib/filecache.php on line 359, referer: 
http://192.168.50.200/owncloud/?app=files

Gr
Johan