diff --git a/packages/ui-default/components/scratchpad/ScratchpadEditorContainer.jsx b/packages/ui-default/components/scratchpad/ScratchpadEditorContainer.jsx
index 05d0c613c..70cb14600 100644
--- a/packages/ui-default/components/scratchpad/ScratchpadEditorContainer.jsx
+++ b/packages/ui-default/components/scratchpad/ScratchpadEditorContainer.jsx
@@ -4,7 +4,7 @@ import monaco, { registerAction } from 'vj/components/monaco/index';
 
 const mapStateToProps = (state) => ({
   value: state.editor.code,
-  language: window.LANGS[state.editor.lang].monaco,
+  language: window.LANGS[state.editor.lang]?.monaco,
   theme: 'vs-light',
   mainSize: state.ui.main.size,
   pretestSize: state.ui.pretest.size,
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index 596ecc50c..223377815 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.21.1",
+  "version": "4.21.2",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",