[Thu May 11 20:33:56.932792 2017] [core:error] [pid 3690] [client 94.63.XXX.XXX:40273] Caught race condition abuser. attacker: 536, victim: 0 open file owner: 0, open file: /home/domain.tld/public_html/pub/static/frontend/Magento/luma/en_US/images/logo.svg, referer: http://www.domain.tld/

Bad permission or ownership can trigger this error. Try to:

chown user: /home/domain.tld/public_html/pub/ -R