✅ A second operation was started on this context instance before a previous operation completed.

System.InvalidOperationException: A second operation was started on this context instance before a previous operation completed. This is usually caused by different threads concurrently using the same instance of DbContext. For more information on how to avoid threading issues with DbContext, see https://go.microsoft.com/fwlink/?linkid=2097913.
   at Microsoft.EntityFrameworkCore.Infrastructure.Internal.ConcurrencyDetector.EnterCriticalSection()
   at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.Enumerator.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at GradeProject.Components.Pages.ProfilePage.GetLeaderboardPositionAsync(Int32 score) in c:\Users\peter\Desktop\Grade\GradeProject\GradeProject\Components\Pages\ProfilePage.razor:line 143
   at GradeProject.Components.Pages.ProfilePage.OnInitializedAsync() in c:\Users\peter\Desktop\Grade\GradeProject\GradeProject\Components\Pages\ProfilePage.razor:line 135
   at Microsoft.AspNetCore.Components.ComponentBase.RunInitAndSetParametersAsync()

System.InvalidOperationException: A second operation was started on this context instance before a previous operation completed. This is usually caused by different threads concurrently using the same instance of DbContext. For more information on how to avoid threading issues with DbContext, see https://go.microsoft.com/fwlink/?linkid=2097913.
   at Microsoft.EntityFrameworkCore.Infrastructure.Internal.ConcurrencyDetector.EnterCriticalSection()
   at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.Enumerator.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at GradeProject.Components.Pages.ProfilePage.GetLeaderboardPositionAsync(Int32 score) in c:\Users\peter\Desktop\Grade\GradeProject\GradeProject\Components\Pages\ProfilePage.razor:line 143
   at GradeProject.Components.Pages.ProfilePage.OnInitializedAsync() in c:\Users\peter\Desktop\Grade\GradeProject\GradeProject\Components\Pages\ProfilePage.razor:line 135
   at Microsoft.AspNetCore.Components.ComponentBase.RunInitAndSetParametersAsync()

csharp @using GradeProject.Components.Account.Shared

<MediaQueryList>
    <ViewTransitionRouter AppAssembly="typeof(Program).Assembly">
        <Found Context="routeData">
            <AuthorizeRouteView RouteData="routeData" DefaultLayout="@(isMobile ? typeof(Layout.MobileLayout) : typeof(Layout.MainLayout))">
                <NotAuthorized>
                    <RedirectToLogin/>
                </NotAuthorized>
            </AuthorizeRouteView>
            <FocusOnNavigate RouteData="routeData" Selector="[autofocus]"/>
        </Found>
    </ViewTransitionRouter>
    <MediaQuery Media="(max-width: 600px)" @bind-Matches="isMobile" />
</MediaQueryList>

@code {
    private bool isMobile;
}

csharp @using GradeProject.Components.Account.Shared

<MediaQueryList>
    <ViewTransitionRouter AppAssembly="typeof(Program).Assembly">
        <Found Context="routeData">
            <AuthorizeRouteView RouteData="routeData" DefaultLayout="@(isMobile ? typeof(Layout.MobileLayout) : typeof(Layout.MainLayout))">
                <NotAuthorized>
                    <RedirectToLogin/>
                </NotAuthorized>
            </AuthorizeRouteView>
            <FocusOnNavigate RouteData="routeData" Selector="[autofocus]"/>
        </Found>
    </ViewTransitionRouter>
    <MediaQuery Media="(max-width: 600px)" @bind-Matches="isMobile" />
</MediaQueryList>

@code {
    private bool isMobile;
}