diff --git a/src/controls/templates/OverlayDrawer.qml b/src/controls/templates/OverlayDrawer.qml
--- a/src/controls/templates/OverlayDrawer.qml
+++ b/src/controls/templates/OverlayDrawer.qml
@@ -111,7 +111,7 @@
         property int startX
         property int mappedStartX
 
-        property bool desktopMode: applicationWindow() && applicationWindow().header.toString().indexOf("ToolBarApplicationHeader") !== -1
+        property bool desktopMode: applicationWindow() && applicationWindow().header && applicationWindow().header.toString().indexOf("ToolBarApplicationHeader") !== -1
         enabled: root.handleVisible && root.modal
 
         onPressed: {
diff --git a/src/controls/templates/OverlaySheet.qml b/src/controls/templates/OverlaySheet.qml
--- a/src/controls/templates/OverlaySheet.qml
+++ b/src/controls/templates/OverlaySheet.qml
@@ -383,7 +383,7 @@
             //* the sheet is disaplayed *under* the controls
             property int extraMargin: (!root.parent ||
                 applicationWindow === "undefined" ||
-                (root.parent === applicationWindow().overlay && root.parent.action.main) ||
+                (root.parent === applicationWindow().overlay && root.parent.action && root.parent.action.main) ||
                 !applicationWindow().controlsVisible ||
                 !applicationWindow().header ||
                 applicationWindow().header.toString().indexOf("ToolBarApplicationHeader") === 0)