Patrick Bamford wasted a golden chance to score his first Crystal Palace goal as the Eagles played out a frustrating goalless draw with Swansea.
Chelsea loan striker Bamford blasted straight at a grateful Lukasz Fabianski, spurning Palace's finest chance to secure victory at Selhurst Park.
Swansea held firm for a draw that could prove vital in their continued Premier League survival fight, a second clean sheet after their 1-0 St Stephen's Day win over West Brom.
The ineffectual Marouane Chamakh was hauled off after a first half that elicited no chances for either side. Bamford at least worked several openings, but was left to rue the miss of the day.
Yohan Cabaye will also now miss Palace's home clash against Chelsea on Sunday after collecting his fifth league booking.
The hosts finally carved out a chance when play resumed, but no thanks to the personnel switch.
Fabianski denied Palace the opener, palming away Hangeland's header after a well-worked free-kick.
Jason Puncheon almost carved an opening for Bamford with an ambitious attempted through-ball, but still the deadlock remained.
Barrow blasted Swansea's first shot on target from 20 yards, but Hennessey met his rare task with relative comfort.
Bamford then blasted straight at Fabianski as Palace battled again for the ascendancy. The 22-year-old simply had to score with a strike from 12 yards out.