diff --git a/src/battle-scene.ts b/src/battle-scene.ts
index 8c3ce016525..1d781f17e9b 100644
--- a/src/battle-scene.ts
+++ b/src/battle-scene.ts
@@ -997,8 +997,8 @@ export default class BattleScene extends SceneBase {
         pokemon.variant = pokemon.getVariant();
         pokemon.name = pokemon.getNameToRender();
         if (pokemon.isFusion()) {
-          pokemon.fusionVariant = pokemon.battleData?.illusion.basePokemon!.fusionVariant ?? pokemon.fusionVariant;
-          pokemon.fusionShiny = pokemon.battleData?.illusion.basePokemon!.fusionShiny ?? pokemon.fusionShiny;
+          pokemon.fusionVariant = pokemon.battleData?.illusion.basePokemon?.fusionVariant ?? pokemon.fusionVariant;
+          pokemon.fusionShiny = pokemon.battleData?.illusion.basePokemon?.fusionShiny ?? pokemon.fusionShiny;
         }
       });
     }