diff --git a/src/data/pokeball.ts b/src/data/pokeball.ts
index 1e271a719f8..a2d45e8636a 100644
--- a/src/data/pokeball.ts
+++ b/src/data/pokeball.ts
@@ -49,7 +49,7 @@ export function getPokeballName(type: PokeballType): string {
   return ret;
 }
 
-export function getPokeballCatchMultiplier(type: PokeballType, enemyPokemon?: Pokemon, getBoostedDescription?: boolean): number {
+export function getPokeballCatchMultiplier(type: PokeballType, enemyPokemon?: Pokemon | null, getBoostedDescription?: boolean): number {
   const pokemon = enemyPokemon ?? null;
   const description = getBoostedDescription ?? false;
   switch (type) {
diff --git a/src/modifier/modifier-type.ts b/src/modifier/modifier-type.ts
index 42183148b85..3e1012e13fb 100644
--- a/src/modifier/modifier-type.ts
+++ b/src/modifier/modifier-type.ts
@@ -181,7 +181,7 @@ class AddPokeballModifierType extends ModifierType {
   }
 
   getDescription(scene: BattleScene): string {
-    let catchRate: String;
+    let catchRate: String = "";
     if (this.pokeballType === PokeballType.ROGUE_BALL) {
       catchRate = i18next.t("modifierType:ModifierType.AddPokeballModifierType.catchRateGenerator", {
         "normalCatchRate": getPokeballCatchMultiplier(this.pokeballType),