Update: Hendricks made weight on his second attempt.
Disaster struck UFC 171's main card Friday afternoon, as a visibly drained Hendricks missed weight by 1.5 pounds ahead of his championship fight against Robbie Lawler.
Hendricks, who weighed in gaunt and shaking on his first attempt, has two hours to meet the required welterweight limit of 170 pounds.
"It was a (surprise). I thought we made it," Hendricks said. "We'll see what happens in an hour."
Lawler successfully weighed in at 170 pounds.
"Nobody saw this coming," said Dana White to FOX. "He didn't see this coming."
Hendricks' nutritionist Mike Dolce said it was "easy" to get him down to 170 pounds, albeit a tad later than expected.
"Johny's scale might have gotten damaged at the hotel gym earlier today," he told MMAFighting.com. "We did a light workout and the weight fell off easily."
Complete UFC 171 weigh-in results can be seen below.
Main card (PPV at 10 p.m. ET)
Johny Hendricks (171.5 on first attempt, 170 on second attempt) vs. Robbie Lawler (170)
Carlos Condit (170.5) vs. Tyron Woodley (170)
Diego Sanchez (155) vs. Myles Jury (156)
Jake Shields (171) vs. Hector Lombard (170)
Ovince St. Preux (205) vs. Nikita Kyrlov (205)
Undercard (FOX Sports 2 at 8 p.m. ET)
Kevin Gastelum (172.5 on first attempt, 172 on second attempt, 171 on third attempt) vs. Rick Story (170)
Raquel Pennington (135.5) vs. Jessica Andrade (135)
Dennis Bermudez (146) vs. Jimy Hettes (145.5)
Sean Spencer (170) vs. Alex Garcia (170.5)
Undercard (UFC Fight Pass at 6 p.m. ET)
Renee Forte (157, will forfeit 20 percent of purse) vs. Francisco Trevino (155)
Will Campuzano (125.5) vs. Justin Scoggins (125)
Bubba McDaniel (184.5) vs. Sean Strickland (185)
Daniel Pineda (145) vs. Robert Whiteford (145)