Gallagher's goal was not enough for the Eagles to score three points.
Crystal Palace in the twenty-second round of the championship match went to visit Brighton and won.
The first goal of the match was scored in the middle of the first half of the game by the efforts of Gallagher, to which the hosts answered with Andersen's own goal.
Brighton - Crystal Palace 1-1 Goals: Andersen, 87 (own goal) - Gallagher, 69 Brighton: Sanchez - Veltman (Welbeck, 73), Webster, Bern, Cucurella - Gross (March, 73), McAllister, Lallana (Lamptee).
Crystal Palace: Butland - Ward, Andersen, Gehi, Mitchell - Schlupp, Hughes, Gallagher - Benteke, Eze (Milivojevic 66), Olise, Edouard (Mateta 66).
Warnings: Eze, Hughes.