The Coyotes won the game 2-1 but may have suffered a longer term loss with goalie Mike Smith being forced to leave the game with an injury.
Florida pressed for the equalizer and were awarded a penalty shot after a pair of Coyotes players pushed the net off its moorings. Weiss' shot trickled through LaBarbera but slid to a stop as it reached the goal line.
"That's [LaBarbera's] role on our team is just that. Whenever he is called upon, he's got to do his job. Great to see him jump in there and do it," said Phoenix head coach Dave Tippett.
Jose Theodore made 20 saves for Florida, which had its home points streak snapped at eight games (6-0-2).
On the other hand, one streak was extended as each of the Panthers' last 13 home games have been decided by one goal (6-2-5).
The Coyotes opened the scoring late in the first period on a 5-on-3 power play as Oliver Ekman-Larsson fed Whitney for a one-timer in the left circle with seven seconds remaining.
Whitney scored his 100th career power-play goal...The Panthers lost in regulation on home ice for the first time since November 13 against Philadelphia.