Lekhwiya were on course for a sixth win of the season after taking a 36th-minute lead through Adel Lami but hosts Al Khrityat drew level just before the hour thanks to Yahia Kebe's goal.
Despite being unable to hold on for the win, Lekhwiya still increased their lead at the summit to three points after second-placed Al Wakra slumped to a 2-0 home defeat against Al Sadd.
Hasan Al Haydos put Al Sadd ahead in the 56th minute and Magid Mohammed doubled the lead 60 seconds later to help his side move level on 16 points with their opponents.
Al Rayyan and Qatar are also both on 16 points after they shared a 2-2 draw.
Al Rayyan looked to be cruising thanks to a first-half double from Rodrigo Tabata but quickfire goals from Sebastian Soria (72) and Abdulla Al Kuwari (75) in the second half earned Qatar a point.