diff --git a/views/problem.ejs b/views/problem.ejs
index 2874221..2c60881 100644
--- a/views/problem.ejs
+++ b/views/problem.ejs
@@ -202,6 +202,7 @@ editor.setShowPrintMargin(false);
 editor.renderer.updateFontSize();
 
 function submit_code() {
+  if (!editor.getValue().trim()) return false;
   $('#submit_code input[name=language]').val($('#languages-menu .item.active').data('value'));
   $('#submit_code input[name=code]').val(editor.getValue());
   return true;