Castleford captain Ryan Hudson has escaped any punishment after coming into contact with referee Steve Ganson at Wigan on Friday.
Hudson was placed on report for the incident which occurred after Ganson had disallowed a Castleford try early on in the game.
The Tigers still went on to win the game 28-22 to hand out a third Super League defeat to Wigan, but former Huddersfield hooker Hudson looked like he was in big trouble.
Wigan second rower Gareth Hock was given a five-match ban for tugging the arm of referee Ian Smith last season, and Hudson would have faced at least the same had his clash with the referee been proven.
However, video replays proved inconclusive for the RFL's match review panel, who gave Hudson the benefit of any doubt but did warn him about his future conduct.
Warrington's England forward Ben Westwood, however, is facing a possible five-match ban after being charged with a grade D offence against Catalans Dragons.
Westwood took out Dragons forward Dane Carlaw with a high tackle as the Wolves lost at home, and was put on report by referee Jason Robinson.
Westwood will appear before the RFL disciplinary committee on Tuesday night, along with Catalans second rower Jamal Fakir, who has been charged with a grade C high tackle.
There were several big hits during the game at the Halliwell Jones, but Catalans centre Adam Mogg will not face further action after he was also put on report for a high tackle.
Warrington prop Garreth Carvell has been given a formal caution for a tripping offence in the same match.