diff --git a/src/FrontOffice.Main/Shared/OrganizationChartLevel.razor.cs b/src/FrontOffice.Main/Shared/OrganizationChartLevel.razor.cs
index 6b27733..557c53b 100644
--- a/src/FrontOffice.Main/Shared/OrganizationChartLevel.razor.cs
+++ b/src/FrontOffice.Main/Shared/OrganizationChartLevel.razor.cs
@@ -21,7 +21,7 @@ public partial class OrganizationChartLevel
 
     private void ToggleNodeExpand(long userId)
     {
-        ParentChart.ToggleNodeExpand(userId);
+        ParentChart?.ToggleNodeExpand(userId);
     }
 
     public class UserNode