Warriors half back Shaun Johnson was his own biggest critic after the 30-18 loss to the Panthers on Saturday night, labelling his mistake for Penrith's first try "unacceptable".
It happened early in the match, but was still critical and summed up a game of occasional, but costly lapses for the New Zealand side.
The Warriors were leading 6-0 and had a strong wind behind them, when they conceded a bizarre try which shifted the first half momentum.
Tui Lolohea was driven back following a deep Jamie Soward kick, the fullback guilty of being too upright as he returned the ball. At dummy half a metre from his own line, Johnson dummied to David Fusitua and tried to run himself. He was pushed back into the in goal - in what resembled a driving maul - before his attempted off-load was dived on by Soward.
"[There] were errors at crucial times," said Johnson.