It may be the offseason, but former Islanders goaltender Robin Lehner still needs one more big save.

On Saturday the 28-year-old Swede tweeted a picture of what appears to be the replica Masterton Trophy — awarded to the “player who best exemplifies the qualities of perseverance, sportsmanship, and dedication to ice hockey” — he won earlier this summer at the NHL Awards ceremony.

But the inscription reads “New York Rangers,” rather than “New York Islanders.”

“You had one job …” Lehner wrote beneath the photo.

Lehner, who signed a one-year, $5 million contract with the Blackhawks this offseason after negotiations with the Islanders mysteriously fell apart, won the prestigious award for fighting his way back from mental illness and substance abuse.

“I’m not ashamed to say I’m mentally ill,” Lehner said during his acceptance speech, “but that doesn’t mean I’m mentally weak.”

Lehner also came away with the Williams M. Jennings Trophy alongside former teammate Thomas Greiss as the Isles allowed the fewest goals last season. Lehner went 25-13 with a 2.13 goals-against average, and led the club to the second round of the playoffs