diff --git a/Modules/Bar/Widgets/ActiveWindow.qml b/Modules/Bar/Widgets/ActiveWindow.qml
index e55086e..5291991 100644
--- a/Modules/Bar/Widgets/ActiveWindow.qml
+++ b/Modules/Bar/Widgets/ActiveWindow.qml
@@ -48,14 +48,18 @@ RowLayout {
     // Try CompositorService first
     const focusedWindow = CompositorService.getFocusedWindow()
     if (focusedWindow && focusedWindow.appId) {
-      return Icons.iconForAppId(focusedWindow.appId.toLowerCase())
+      const idValue = focusedWindow.appId
+      const normalizedId = (typeof idValue === 'string') ? idValue : String(idValue)
+      return Icons.iconForAppId(normalizedId.toLowerCase())
     }
 
     // Fallback to ToplevelManager
     if (ToplevelManager && ToplevelManager.activeToplevel) {
       const activeToplevel = ToplevelManager.activeToplevel
       if (activeToplevel.appId) {
-        return Icons.iconForAppId(activeToplevel.appId.toLowerCase())
+        const idValue2 = activeToplevel.appId
+        const normalizedId2 = (typeof idValue2 === 'string') ? idValue2 : String(idValue2)
+        return Icons.iconForAppId(normalizedId2.toLowerCase())
       }
     }
 
diff --git a/Services/CompositorService.qml b/Services/CompositorService.qml
index 173d3d6..3a5545f 100644
--- a/Services/CompositorService.qml
+++ b/Services/CompositorService.qml
@@ -192,9 +192,9 @@ Singleton {
         }
 
         windowsList.push({
-                           "id": toplevel.address || "",
-                           "title": toplevel.title || "",
-                           "appId": appId,
+                           "id": (toplevel.address !== undefined && toplevel.address !== null) ? String(toplevel.address) : "",
+                           "title": (toplevel.title !== undefined && toplevel.title !== null) ? String(toplevel.title) : "",
+                           "appId": (appId !== undefined && appId !== null) ? String(appId) : "",
                            "workspaceId": toplevel.workspace?.id || null,
                            "isFocused": toplevel.activated === true
                          })