fix(v2): set stored theme only if it exists (#2113)

facebook · Dec 10, 2019 · bbc1d2c · bbc1d2c
1 parent ba7c38c
commit bbc1d2c
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/packages/docusaurus-theme-classic/src/theme/hooks/useTheme.js b/packages/docusaurus-theme-classic/src/theme/hooks/useTheme.js
@@ -14,7 +14,10 @@ const useTheme = () => {
   );
   React.useEffect(() => {
     try {
-      setTheme(localStorage.getItem('theme'));
+      const localStorageTheme = localStorage.getItem('theme');
+      if (localStorageTheme !== null) {
+        setTheme(localStorageTheme);
+      }
     } catch (err) {
       console.error(err);
     }