1 files changed, 2 insertions, 3 deletions
diff --git a/ext/bg/js/settings/popup-preview-frame.js b/ext/bg/js/settings/popup-preview-frame.js
index 8c354bf7..e900d4e2 100644
--- a/ext/bg/js/settings/popup-preview-frame.js
+++ b/ext/bg/js/settings/popup-preview-frame.js
@@ -88,10 +88,9 @@ class SettingsPopupPreview {
         // This simulates the stylesheet priorities when injecting using the web extension API.
         const result = await this.popupSetCustomOuterCssOld.call(this.popup, ...args);
 
-        const outerStylesheet = Popup.outerStylesheet;
         const node = document.querySelector('#client-css');
-        if (node !== null && outerStylesheet !== null) {
-            node.parentNode.insertBefore(outerStylesheet, node);
+        if (node !== null && result !== null) {
+            node.parentNode.insertBefore(result, node);
         }
 
         return result;