diff --git a/webextensions/background/tab-context-menu.js b/webextensions/background/tab-context-menu.js
index 5b52a5108..aa660c212 100644
--- a/webextensions/background/tab-context-menu.js
+++ b/webextensions/background/tab-context-menu.js
@@ -599,7 +599,7 @@ async function onShown(info, contextTab) {
     updateItem('context_toggleMuteTab', {
       visible: emulate && contextTab,
       multiselected,
-      title: Commands.getMenuItemTitle(mItemsById.context_toggleMuteTab, {
+      title: contextTab && Commands.getMenuItemTitle(mItemsById.context_toggleMuteTab, {
         multiselected,
         unmuted: (!contextTab.mutedInfo || !contextTab.mutedInfo.muted),
       }),