From 704bc0c28fe1cf05ef805bd213a919751368b781 Mon Sep 17 00:00:00 2001
From: rakannimer <rakannimer@gmail.com>
Date: Mon, 30 Sep 2019 16:05:59 -0400
Subject: [PATCH] fix(gatsby-theme-docz): check for window before reading
 location

---
 core/gatsby-theme-docz/src/components/NavLink/index.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/core/gatsby-theme-docz/src/components/NavLink/index.js b/core/gatsby-theme-docz/src/components/NavLink/index.js
index 0ea9dbde2..bcad5400b 100644
--- a/core/gatsby-theme-docz/src/components/NavLink/index.js
+++ b/core/gatsby-theme-docz/src/components/NavLink/index.js
@@ -13,6 +13,13 @@ const getHeadings = (route, docs) => {
   return headings ? headings.filter(heading => heading.depth === 2) : []
 }
 
+const getCurrentHash = () => {
+  if (typeof window === 'undefined') {
+    return ''
+  }
+  return window.location ? window.location.hash : ''
+}
+
 export const NavLink = ({ item, ...props }) => {
   const docs = useDocs()
   const to = item.route
@@ -20,7 +27,7 @@ export const NavLink = ({ item, ...props }) => {
   const current = useCurrentDoc()
   const isCurrent = item.route === current.route
   const showHeadings = isCurrent && headings && headings.length > 0
-  const currentHash = location ? location.hash : ''
+  const currentHash = getCurrentHash()
   return (
     <React.Fragment>
       <Link {...props} to={to} sx={styles.link} activeClassName="active" />