diff --git a/src/data/abilities/ability.ts b/src/data/abilities/ability.ts
index 1ef76af50de..97953dd6169 100644
--- a/src/data/abilities/ability.ts
+++ b/src/data/abilities/ability.ts
@@ -1983,7 +1983,7 @@ export class AllyMoveCategoryPowerBoostAbAttr extends FieldMovePowerBoostAbAttr
    */
   constructor(boostedCategories: MoveCategory[], powerMultiplier: number) {
     super((_pokemon, _defender, move) => {
-      if (_pokemon === null) {
+      if (isNullOrUndefined(pokemon)) {
         return false;
       }
       return boostedCategories.includes(_pokemon.getMoveCategory(_defender, move));