diff --git a/packages/backend/test/e2e/reversi-game.ts b/packages/backend/test/e2e/reversi-game.ts
index c1f30a8f4c..1511eec9a0 100644
--- a/packages/backend/test/e2e/reversi-game.ts
+++ b/packages/backend/test/e2e/reversi-game.ts
@@ -26,7 +26,7 @@ describe('ReversiGame', () => {
 		assert.strictEqual(response2.status, 200);
 		assert.notStrictEqual(response2.body, null);
 		const body = response2.body as misskey.entities.ReversiMatchResponse;
-		assert.strictEqual(body.user1.id, alice.id);
+		assert.strictEqual(body?.user1.id, alice.id);
 		assert.strictEqual(body.user2.id, bob.id);
 	});
 });