add safe check in addon docs webpack preset

storybookjs · Aug 2, 2023 · 2d5a757 · 2d5a757
1 parent bdbd335
commit 2d5a757
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/code/addons/docs/src/preset.ts b/code/addons/docs/src/preset.ts
@@ -105,7 +105,7 @@ async function webpack(
     module: {
       ...module,
       rules: [
-        ...module.rules,
+        ...(module.rules || []),
         {
           test: /(stories|story)\.mdx$/,
           use: [