Thousands of Liverpool fans walked out of Anfield in protest at ticket prices as struggling Sunderland came from 2-0 behind to secure a crucial point.
Roberto Firmino headed the Reds in front after James Milner's clever cross before the goalscorer turned provider to allow Adam Lallana to tap home.
Fans were pouring out when Reds goalkeeper Simon Mignolet was beaten by Adam Johnson's free-kick.
Jermain Defoe completed the comeback after finishing from 10 yards.
His side's defending will not have done his health any good whatsoever as the Reds capitulated in the final eight minutes following the walkout by fans.
Mignolet was at fault after being beaten all too easily by substitute Johnson's set-piece before Mamadou Sakho allowed Defoe to turn and score.
It was the same old story for the Reds, who are still without a Premier League home win in 2016.
They are also still hunting a first clean sheet of the calendar year, having conceded 14 times in the past six games.
Liverpool's top-five hopes vanishing
The Reds remain eighth in the table, but their inconsistent form is testing the patience of fans and hurting Liverpool's chances of qualifying for Europe.
Klopp's side will earn a place in the third qualifying round of next season's Europa League if they beat Manchester City in the League Cup final on 28 February.
However, their chances of qualifying via a top-five finish are rapidly diminishing.
They are 10 points off a top-four place and five adrift of fifth - having played a game more - after one win in six.
Can Sunderland stay up?
Sunderland remain four points from safety and have now gone 11 Premier League games without a clean sheet, longer than any other side currently.
(Via: BBC)