diff --git a/src/browser/base/content/ZenUIManager.mjs b/src/browser/base/content/ZenUIManager.mjs
index ad09c36e8..6e3fd803e 100644
--- a/src/browser/base/content/ZenUIManager.mjs
+++ b/src/browser/base/content/ZenUIManager.mjs
@@ -49,7 +49,7 @@ var gZenUIManager = {
     for (const el of this._popupTrackingElements) {
       // target may be inside a shadow root, not directly under the element
       // we also ignore menus inside panels
-      if (!el.contains(showEvent.explicitOriginalTarget) || (showEvent.explicitOriginalTarget && showEvent.explicitOriginalTarget?.closest('panel'))) {
+      if (!el.contains(showEvent.explicitOriginalTarget) || (showEvent.explicitOriginalTarget instanceof Element && showEvent.explicitOriginalTarget?.closest('panel'))) {
         continue;
       }
       document.removeEventListener('mousemove', this.__removeHasPopupAttribute);