Undefined shortcut was not defined as so.

Action.qml

@@ -62,7 +62,7 @@ Item {
     
     Component.onCompleted: {
         // Forwarding to MenuBar. Little hack to make Action shortcuts work properly, because otherwise, they would not trigger
-        if(shortcut != 0) {
+        if(shortcut != 0 && shortcut != undefined) {
             parent.parent.addShortcut(shortcut, root.triggered)
         }
     }

README.md

@@ -23,7 +23,7 @@ When switching from QtQuick.Controls 2 to MixedMenu, the following changes need
 
 |QtQuick.Controls2/Qt.labs            | > |eu.ad5001.MixedMenu                                     |
 |-------------------------------------|---|--------------------------------------------------------|
-|`import import QtQuick.Controls 2.12`| > |`import eu.ad5001.MixedMenu 1.0`                        |
+|`import import QtQuick.Controls 2.12`| > |`import eu.ad5001.MixedMenu 1.1`                        |
 |`menuBar: MenuBar {}`                | > |`MenuBar { id: appMenu }`<br>`menuBar: appMenu.trueItem`|
 
 

eu.ad5001.mixedmenu.qdoc

@@ -17,7 +17,7 @@
  */
  
 /*!
-    \qmlmodule eu.ad5001.MixedMenu 1.0
+    \qmlmodule eu.ad5001.MixedMenu 1.1
     \title MixedMenu QML Module
     \brief Provides a near drop-in replacements for QtQuick.Controls menus allowing to use the platform native ones on supported platforms.
     

qmldir

@@ -1,6 +1,6 @@
 module eu.ad5001.MixedMenu
-MenuBar 1.0 MenuBar.qml
-MenuItem 1.0 MenuItem.qml
-Action 1.0 Action.qml
-Menu 1.0 Menu.qml
-MenuSeparator 1.0 MenuSeparator.qml
+MenuBar 1.1 MenuBar.qml
+MenuItem 1.1 MenuItem.qml
+Action 1.1 Action.qml
+Menu 1.1 Menu.qml
+MenuSeparator 1.1 MenuSeparator.qml