From 15758b3e7f88de9952446837872621470c68dfeb Mon Sep 17 00:00:00 2001
From: jurajk <kiss@lbstudio.sk>
Date: Tue, 3 Mar 2020 10:55:53 +0100
Subject: [PATCH 1/2] prevent error when no mdx language is defined

---
 packages/styleguide/src/components/MDX/MDX.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/packages/styleguide/src/components/MDX/MDX.js b/packages/styleguide/src/components/MDX/MDX.js
index 081204f20d9..c49fc4463ef 100644
--- a/packages/styleguide/src/components/MDX/MDX.js
+++ b/packages/styleguide/src/components/MDX/MDX.js
@@ -36,7 +36,10 @@ export const MDXComponents = {
   a: props => <Link {...props} />,
   inlineCode: props => <Code {...props} />,
   code: props => (
-    <CodeBlock language={props.className.replace(/language-/, '')} {...props} />
+    <CodeBlock
+      language={props.className && props.className.replace(/language-/, '')}
+      {...props}
+    />
   ),
 };
 

From bc5e23d5626f098279f567a71e3b018f6a0ea351 Mon Sep 17 00:00:00 2001
From: jurajk <kiss@lbstudio.sk>
Date: Wed, 4 Mar 2020 10:39:20 +0100
Subject: [PATCH 2/2] use optional chaining to assign language

---
 packages/styleguide/src/components/MDX/MDX.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/styleguide/src/components/MDX/MDX.js b/packages/styleguide/src/components/MDX/MDX.js
index c49fc4463ef..cb830beb8a3 100644
--- a/packages/styleguide/src/components/MDX/MDX.js
+++ b/packages/styleguide/src/components/MDX/MDX.js
@@ -37,7 +37,7 @@ export const MDXComponents = {
   inlineCode: props => <Code {...props} />,
   code: props => (
     <CodeBlock
-      language={props.className && props.className.replace(/language-/, '')}
+      language={props.className?.replace(/language-/, '')}
       {...props}
     />
   ),