Whitelisting website doesn't work

Every time I visit my friend’s website, I get a series of Avast security alerts that say “Threat Secured: We’ve safely aborted your connection on [address] because it was infected with URL:Blacklist.” I’ve brought this to my friend’s attention, and he says this appears to somehow be related to certain images he has on the site. He’s changed some settings on his end and has been trying to research how to fix this, but so far he hasn’t has any luck.

In the meantime, the alerts have gotten really annoying, so I’ve gone in the Avast software to menu > settings > general > exceptions and added the website’s homepage address in homes of making the alerts go away. There’s a * after the address, so adding an exception should in theory prevent me from getting any further alerts from any page I visit on this website, but it’s not working for some reason. Does anyone have any ideas how to fix this??

Thanks,
Scott

Please attach a screenshot of the alert you are getting, click the more details option in the alert window to expand the information.

See my attached image on what to do.