diff --git a/modules/permission-management/src/Volo.Abp.PermissionManagement.Blazor/Components/PermissionManagementModal.razor b/modules/permission-management/src/Volo.Abp.PermissionManagement.Blazor/Components/PermissionManagementModal.razor
index a0cd8335c6..8c1f5871db 100644
--- a/modules/permission-management/src/Volo.Abp.PermissionManagement.Blazor/Components/PermissionManagementModal.razor
+++ b/modules/permission-management/src/Volo.Abp.PermissionManagement.Blazor/Components/PermissionManagementModal.razor
@@ -62,7 +62,7 @@
                                 
                                 @foreach (var permission in group.Permissions)
                                 {
-                                    <Field Style="@($"margin-inline-start: {_permissionDepths[permission.Name] * 20}px")">
+                                    <Field Style="@($"margin-inline-start: {GetPermissionDepthOrDefault(permission.Name) * 20}px")">
                                         <Check
                                             Disabled="@(IsDisabledPermission(permission))"
                                             Cursor="Cursor.Pointer"
diff --git a/modules/permission-management/src/Volo.Abp.PermissionManagement.Blazor/Components/PermissionManagementModal.razor.cs b/modules/permission-management/src/Volo.Abp.PermissionManagement.Blazor/Components/PermissionManagementModal.razor.cs
index 36db779626..8a5c82e734 100644
--- a/modules/permission-management/src/Volo.Abp.PermissionManagement.Blazor/Components/PermissionManagementModal.razor.cs
+++ b/modules/permission-management/src/Volo.Abp.PermissionManagement.Blazor/Components/PermissionManagementModal.razor.cs
@@ -182,6 +182,11 @@ public partial class PermissionManagementModal
             }
         }
     }
+    
+    protected virtual int GetPermissionDepthOrDefault(string name)
+    {
+        return _permissionDepths.GetValueOrDefault(name, 0);
+    }
 
     protected virtual void GroupGrantAllChanged(bool value, PermissionGroupDto permissionGroup)
     {