diff --git a/applets/taskmanager/package/contents/ui/ContextMenu.qml b/applets/taskmanager/package/contents/ui/ContextMenu.qml
--- a/applets/taskmanager/package/contents/ui/ContextMenu.qml
+++ b/applets/taskmanager/package/contents/ui/ContextMenu.qml
@@ -52,7 +52,7 @@
     minimumWidth: visualParent.width
 
     onStatusChanged: {
-        if (visualParent && get(atm.LauncherUrlWithoutIcon) != null && status == PlasmaComponents.DialogStatus.Open) {
+        if (visualParent && get(atm.LauncherUrlWithoutIcon) != "" && status == PlasmaComponents.DialogStatus.Open) {
             launcherToggleAction.checked = (tasksModel.launcherPosition(get(atm.LauncherUrlWithoutIcon)) != -1);
             activitiesDesktopsMenu.refresh();
 
@@ -434,7 +434,7 @@
         id: startNewInstanceItem
         visible: (visualParent && get(atm.IsLauncher) !== true && get(atm.IsStartup) !== true)
 
-        enabled: visualParent && get(atm.LauncherUrlWithoutIcon) != null
+        enabled: visualParent && get(atm.LauncherUrlWithoutIcon) != ""
 
         text: i18n("Start New Instance")
         icon: "system-run"