Celtic regained their four-point lead in the Scottish Premiership as they edged out bottom side Kilmarnock for a first league win in three games.
Kasper Hogh thought he ended his 15-match barren spell - since scoring a hat-trick against the Rugby Park side - with a composed finish, but VAR prolonged his personal agony after spotting a soft foul in the build-up.
The pain was shortlived though for Martin O'Neill's side, who lost to Falkirk last Sunday after drawing with Dundee United, as defender Liam Scales volleyed in from close range, leaving goalkeeper Nico Mantl leaden-footed.
The German was alert to deny Benjamin Nygren from the penalty spot in the second half after Aaron Tshibola stopped a shot with his am.
Despite beating Besiktas for their first Europa League win on Thursday, the reigning Scottish champions couldn't bring the energy and excitement from that fantastic finale into their play here.
Instead - after an attempt at a minute's silence for Remembrance Sunday lasted 10 seconds due to disturbance in the stands - Neil McCann's visitors threatened first.
Inside 30 seconds, Tom Lowery forced Celtic goalkeeper Sam Johnstone into a pair of smart, swift saves, but they failed to continue such threat and the Ayrshire side remain two points adrift at the foot of the table, winless in four, heading into the international break.
Dominant Celtic, meanwhile, hung on for their cushion at the summit having played one game more than second-place Rangers.