diff --git a/src/battle-scene.ts b/src/battle-scene.ts
index 0d321c0a240..25723999510 100644
--- a/src/battle-scene.ts
+++ b/src/battle-scene.ts
@@ -15,7 +15,7 @@ import { TextStyle, addTextObject, getTextColor } from "./ui/text";
 import { allMoves } from "./data/move";
 import { ModifierPoolType, getDefaultModifierTypeForTier, getEnemyModifierTypesForWave, getLuckString, getLuckTextTint, getModifierPoolForType, getModifierType, getPartyLuckValue, modifierTypes } from "./modifier/modifier-type";
 import AbilityBar from "./ui/ability-bar";
-import { BlockItemTheftAbAttr, BonusItemChance, DoubleBattleChanceAbAttr, ChangeMovePriorityAbAttr, PostBattleInitAbAttr, applyAbAttrs, applyPostBattleInitAbAttrs } from "./data/ability";
+import { BlockItemTheftAbAttr, BonusItemChanceAbAttr, DoubleBattleChanceAbAttr, ChangeMovePriorityAbAttr, PostBattleInitAbAttr, applyAbAttrs, applyPostBattleInitAbAttrs } from "./data/ability";
 import { allAbilities } from "./data/ability";
 import Battle, { BattleType, FixedBattleConfig } from "./battle";
 import { GameMode, GameModes, getGameMode } from "./game-mode";
@@ -2467,7 +2467,7 @@ export default class BattleScene extends SceneBase {
       const difficultyWaveIndex = this.gameMode.getWaveForDifficulty(this.currentBattle.waveIndex);
       const isFinalBoss = this.gameMode.isWaveFinal(this.currentBattle.waveIndex);
       let chances = Math.ceil(difficultyWaveIndex / 10);
-      if (this.getPlayerPokemon().getAbility().hasAttr(BonusItemChance) || this.getPlayerPokemon().getPassiveAbility().hasAttr(BonusItemChance)) {
+      if (this.getPlayerPokemon()?.getAbility().hasAttr(BonusItemChanceAbAttr) || this.getPlayerPokemon()?.getPassiveAbility().hasAttr(BonusItemChanceAbAttr)) {
         chances += Math.floor(chances * 1.2);
       }
       if (isFinalBoss) {
diff --git a/src/data/ability.ts b/src/data/ability.ts
index 816d5cdb776..a6b19f8c919 100644
--- a/src/data/ability.ts
+++ b/src/data/ability.ts
@@ -2794,12 +2794,12 @@ export class BonusCritAbAttr extends AbAttr {
  * If an ability has this tag, it will increase the chance of items by 20%.
  * This is used in battle-scene.ts in generateEnemyModifiers.
  */
-export class BonusItemChance extends AbAttr {
+export class BonusItemChanceAbAttr extends AbAttr {
   constructor() {
     super(false);
   }
 
-  apply(pokemon: Pokemon, passive: boolean, cancelled: Utils.BooleanHolder, args: any[]): boolean | Promise<boolean> {
+  apply(pokemon: Pokemon, passive: boolean, simulated: boolean, cancelled: Utils.BooleanHolder | null, args: any[]): boolean | Promise<boolean> {
     return true;
   }
 }
@@ -4817,7 +4817,7 @@ export function initAbilities() {
       .attr(PostFaintUnsuppressedWeatherFormChangeAbAttr)
       .bypassFaint(),
     new Ability(Abilities.COMPOUND_EYES, 3)
-      .attr(BonusItemChance)
+      .attr(BonusItemChanceAbAttr)
       .attr(StatMultiplierAbAttr, Stat.ACC, 1.3),
     new Ability(Abilities.INSOMNIA, 3)
       .attr(StatusEffectImmunityAbAttr, StatusEffect.SLEEP)
@@ -5103,7 +5103,7 @@ export function initAbilities() {
       .attr(MoveAbilityBypassAbAttr),
     new Ability(Abilities.SUPER_LUCK, 4)
       .attr(BonusCritAbAttr)
-      .attr(BonusItemChance),
+      .attr(BonusItemChanceAbAttr),
     new Ability(Abilities.AFTERMATH, 4)
       .attr(PostFaintContactDamageAbAttr, 4)
       .bypassFaint(),