Kurt Maflin was warned for making an obscene gesture in the 16th frame of his first round match against David Gilbert.
Maflin directed the gesture towards the table after his bid for a maximum break ended when he ran out of position on the penultimate red.
Referee Tatiana Woollaston took Maflin aside before the start of the next frame and told him: "I have to warn you - the next one, you lose the frame."
World Snooker confirmed that Maflin would not face any further punishment beyond the referee's warning, while Eurosport commentator Dominic Dale apologised to viewers for any offence.
Maflin won the frame to pull the match level as he aimed to become the first qualifier to reach the second round of this year's Championship.
"I meant nothing by it – it was purely aggression being taken out on the cue ball. I felt like I'd worked really hard to get into that position… and when the white hit the yellow, it was just one of those reactions,"he said afterwards.
"She (Woollaston) was whispering and I thought she was telling me to tuck my shirt in, but she told me she had to warn me for the gesture. I wasn’t quite with it at that stage."