Invisibility Bug, Invisible Darius in Black Market Brawl 4th August 2015

I unfortunately did not think of making a screenshot to post with this post but I would like to know if this happens with others (are there invisible allies or enemies for you?) and if it happens only with Darius?

This bug was fixed by a client restart that set me back so much that I lost the game pretty much right there the bug was there from the start and I could not see him on map or in lane I just ate his damage without knowing where he was, I'd like to raise awareness of this bug so its abuse can be avoided.

Please someone look into it as fast as possible, if this bug is abused it might affect ranked gameplay as well as unranked gameplay significantly, Please if someone else has this bug screenshot it or post a video of it and contact support like I do now either here or in another thread