Video referee Steve Ganson has apologised for settling the 219th Hull derby with a decision that drew a furious reaction from KR boss Craig Sandercock.
Ganson, manning the video screens for the Magic Weekend clash, deemed that Chris Green was not offside when he beat Greg Eden to a Danny Houghton kick and crossed to give Hull FC a dramatic 22-16 victory.
The match officials coach failed to spot that Green was in front of Houghton when the ball was kicked and, with the hooker never passing him in the chase, was not brought onside.
Ganson did not put his name to a Rugby Football League statement on Saturday evening but Jon Sharp, head of match officials, said the governing body recognised that a mistake had been made.
"We have reviewed the decision and it is clear that Steve made the wrong call," Sharp said.
"Honesty and accountability are important to the Match Officials Department and we can only apologise for the error.
"Steve has been in contact with Hull Kingston Rovers and offered his apologies. He is one of the sport's most experienced officials and deeply regrets having got it wrong.
"As with all fixtures, we will conduct a full review of the performance of our match officials following Magic Weekend and will take what steps we can to ensure that mistakes like this do not happen again."
An emotional Sandercock had described the controversial defeat as a "tragedy" while the country's most high profile player, Wigan's Sam Tomkins, dubbed the decision the "worst he had ever seen".
"We replayed it on our computer and I was giving instructions to go for a field goal (in the next set) as he (Green) was five metres offside," Sandercock told reporters after the game.
"It's a tragedy and I will be disappointed if (Ganson) doesn't come out and publicly apologise to our supporters and players.
"It's blatant. I was yelling instructions to go for the field goal and everyone in this room could see that. If they come out and say Greg Eden touched the ball... He was a million miles away. I expect the video referee to give an apology to our club."
Sandercock did not get any sympathy from opposite number Peter Gentle, who complained that decisions had gone against his side last season when Rovers won with a similarly dramatic late show.
"It sort of squares it up for last year," Gentle said. "You would need to talk to the referees. I'm not sure about the ruling, but we will take it."
The incident brought back unfortunate memories of the first Magic event in 2007 when Ganson, as an on-field official at Cardiff's Millennium Stadium, gave Leeds an illegal last-minute win over Bradford with a decision for which he later apologised.