On Monday, The Blast reported that the UFC lightweight champion is being sued by a security guard named William Pegg, who claims that he was hit in the back by one of McGregor's presser projectiles - namely a Monster Energy can - and suffered injuries that resulted in $5,000 worth of medical bills.
The lawsuit was filed March 28.
The weird incident happened a pre-fight press conference before he faced Nate Diaz in August a year ago.
Before they actually get there, the two engaged in a bottle throwing contest at each other during the UFC 202 press conference, to which McGregor was fined $25,000 on to of receiving 25 hours of community service.
Pegg is seeking damages and believes he's entitled to at least $95,000. "McGregor Sports & Entertainment is also listed as a defendant in the case".
McGregor did well in the early rounds, before Mayweather took over the fight and stopped the MMA fighter in the tenth round at the T-Mobile Arena in Las Vegas.
McGregor's punishment was eventually reduced in March to a $25,000 (£19,000) fine and 25 hours of community service while Diaz had to pay a $15,000 (£11,400) fine and 15 hours of community service.
He claims that he was hit in the back of the head, near his left shoulder.
Conor McGregor went on to defeat Diaz at UFC 202 by unanimous decision in their rematch from UFC 196, which Nate Diaz won by submission. "The Notorious" one received a UFC record disclosed purse of $3 million for the bout - some $500,000 more than the guaranteed sum that Brock Lesnar earned for his scrap with Mark Hunt at UFC 200.
While the incident was not ideal for UFC president Dana White, it certainly brought more eyeballs to their fight as the event still stands as the company's most successful pay-per-view with 1.65 million buys.