From 684c2364b7c558b2bf198272cbde62aa05e51aba Mon Sep 17 00:00:00 2001
From: ByThePowerOfScience
 <16433721+ByThePowerOfScience@users.noreply.github.com>
Date: Sun, 8 Sep 2024 10:11:55 -0400
Subject: [PATCH] Undef check for pokemon#usedTMs

Fixes #4107
---
 src/phases/learn-move-phase.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/phases/learn-move-phase.ts b/src/phases/learn-move-phase.ts
index 201019e8860..6f0f63ef106 100644
--- a/src/phases/learn-move-phase.ts
+++ b/src/phases/learn-move-phase.ts
@@ -44,6 +44,7 @@ export class LearnMovePhase extends PlayerPartyMemberPokemonPhase {
     if (emptyMoveIndex > -1) {
       pokemon.setMove(emptyMoveIndex, this.moveId);
       if (this.fromTM) {
+        pokemon.usedTMs ??= [];
         pokemon.usedTMs.push(this.moveId);
       }
       initMoveAnim(this.scene, this.moveId).then(() => {