From 25741ac300fe85377148e52e82bacf7f206d1423 Mon Sep 17 00:00:00 2001
From: undefined <i@undefined.moe>
Date: Fri, 3 Feb 2023 19:01:20 +0800
Subject: [PATCH] core: add lang existance check

---
 packages/hydrooj/src/handler/problem.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index ba424cffd..0a38e646b 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -506,7 +506,7 @@ export class ProblemSubmitHandler extends ProblemDetailHandler {
         if (typeof config === 'string' || config === null) throw new ProblemConfigError();
         if (config.type === 'objective') {
             lang = '_';
-        } else if ((config.langs && !config.langs.includes(lang)) || setting.langs[lang].disabled) {
+        } else if ((config.langs && !config.langs.includes(lang)) || !setting.langs[lang] || setting.langs[lang].disabled) {
             throw new ProblemNotAllowLanguageError();
         }
         if (pretest) {