fix postcss-loader (#6461)

I think this should fix #6459
gatsbyjs · Jul 15, 2018 · 00c0f0e · 00c0f0e
1 parent e67e533
commit 00c0f0e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/packages/gatsby/src/utils/webpack-utils.js b/packages/gatsby/src/utils/webpack-utils.js
@@ -229,7 +229,7 @@ module.exports = async ({
               flexbugs,
               autoprefixer({ browsers, flexbox: `no-2009` }),
               ...plugins,
-            ]
+            ].filter(Boolean)
           },
           ...postcssOpts,
         },