Error 0!

Hi, I have Joomla 3.4.1 and OS Property 2.8.1.
Sometimes I have this error on homepage :
0
Error: 0
File is not a valid image: /var/www/vhosts/.../Root Joomla Folder/images/osproperty/properties/159/thumb/

If I reload page it's Ok, error disappear.
What Wrong ?

Thank you for your help.

Hi Fredric,
I am not sure with this kind of issue but you can please submit ticket and send your site information with super admin account so i can check the issue for you.
Thanks
Dam