diff --git a/src/snek/system/markdown.py b/src/snek/system/markdown.py
index 23d0656..198f589 100644
--- a/src/snek/system/markdown.py
+++ b/src/snek/system/markdown.py
@@ -28,9 +28,11 @@ class MarkdownRenderer(HTMLRenderer):
         if not lang:
             lang = info
         if not lang:
-            return f"<div>{code}</div>"
+            lang = 'bash'
             # return '\n<pre><code>%s</code></pre>\n' % escape(code)
         lexer = get_lexer_by_name(lang, stripall=True)
+        if not lexer:
+            return f"<pre>{code}</pre>"
         formatter = html.HtmlFormatter(lineseparator="<br>")
         return highlight(code, lexer, formatter)