fix: fix builds without gatsby-config gatsbyjs#8917 (gatsbyjs#9256)

gpetrioli · Jan 22, 2019 · b39f040 · b39f040
1 parent 6bf3287
commit b39f040
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/packages/gatsby/src/bootstrap/index.js b/packages/gatsby/src/bootstrap/index.js
@@ -73,7 +73,7 @@ module.exports = async (args: BootstrapArgs) => {
   )
 
   // theme gatsby configs can be functions or objects
-  if (config.__experimentalThemes) {
+  if (config && config.__experimentalThemes) {
     const themesConfig = await Promise.mapSeries(
       config.__experimentalThemes,
       async ([themeName, themeConfig]) => {