1 files changed, 2 insertions, 2 deletions
diff --git a/ext/bg/js/settings/popup-preview-frame.js b/ext/bg/js/settings/popup-preview-frame.js
index c2c91202..8225ecb8 100644
--- a/ext/bg/js/settings/popup-preview-frame.js
+++ b/ext/bg/js/settings/popup-preview-frame.js
@@ -105,8 +105,8 @@ class PopupPreviewFrame {
         return options;
     }
 
-    _onCustomOuterCssChanged({node}) {
-        if (node === null) { return; }
+    _onCustomOuterCssChanged({node, inShadow}) {
+        if (node === null || inShadow) { return; }
 
         const node2 = document.querySelector('#popup-outer-css');
         if (node2 === null) { return; }