diff --git a/DM_Weight/ViewModels/RoleManagerWindowViewModel.cs b/DM_Weight/ViewModels/RoleManagerWindowViewModel.cs
index 1f28be3..619a102 100644
--- a/DM_Weight/ViewModels/RoleManagerWindowViewModel.cs
+++ b/DM_Weight/ViewModels/RoleManagerWindowViewModel.cs
@@ -117,7 +117,7 @@ namespace DM_Weight.ViewModels
                             {
                                 int i = p.Children.ToList().FindIndex(it4 => it4.Id == it3.Id);
                                 //if (i > 0 && AllPremissions.ElementAt(index).Children.Count > i)
-                                if (p.Children[i] != null)
+                                if (p.Children.Count > 0 && i >= 0 && p.Children[i] != null)
                                 {
                                     AllPremissions.ElementAt(index).Children.RemoveAt(i);
                                 }