From c99d9f3038d5288bb5dff6b4dba9287af3221757 Mon Sep 17 00:00:00 2001
From: Smart-Codi <codemaster08240328@gmail.com>
Date: Tue, 5 Apr 2022 17:20:31 -0400
Subject: [PATCH] fix: Clean up custom css when dashboard unmounted (#19342)

* clean up custom css when dashboard unmounted

* resolve comment
---
 superset-frontend/src/dashboard/containers/DashboardPage.tsx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/superset-frontend/src/dashboard/containers/DashboardPage.tsx b/superset-frontend/src/dashboard/containers/DashboardPage.tsx
index c0f56322f6172..ac479fd3dde28 100644
--- a/superset-frontend/src/dashboard/containers/DashboardPage.tsx
+++ b/superset-frontend/src/dashboard/containers/DashboardPage.tsx
@@ -232,7 +232,7 @@ export const DashboardPage: FC<PageProps> = ({ idOrSlug }: PageProps) => {
   }, [dashboard_title]);
 
   useEffect(() => {
-    if (css) {
+    if (typeof css === 'string') {
       // returning will clean up custom css
       // when dashboard unmounts or changes
       return injectCustomCss(css);