ui: sublang select

packages/ui-default/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.14.13",
+  "version": "4.14.14",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",

packages/ui-default/pages/problem_submit.page.js

@@ -41,7 +41,7 @@ const page = new NamedPage(['problem_submit', 'contest_detail_problem_submit', '
     $('#codelang-main-select').val(m);
     const fallback = onChangeMain.call({ value: m }, false);
     $('#codelang-sub-select').val(current);
-    if (!$('#codelang-sub-select').val()) {
+    if (fallback && !$('#codelang-sub-select').val()) {
       $('#codelang-sub-select').val(fallback);
       $('[name="lang"]').val(fallback);
     }