Uploading images under contacts: failed to open stream

I have problems uploading contact images since the 6.4 update: PHP Warning: mime_content_type(/tmp/phpETo9ZX): failed to open stream: No such file or directory in /var/lib/shared/websites/crm/www/vtlib/Vtiger/Functions.php on line 595

As mentioned by @guillaume.hilt in the last comment of ticket #1 (closed) the code seems to be in the wrong order.

move_uploaded_file should be called after validateImageFile and not before.

I have changed the code order and now it works again, seems like a bug added in 6.4.