Getting a null reference while using GetElementType()

I'm trying to make my graphQL mutation generic. But on runtime i get an error.
The error says: Object reference not set to an instance of an object.

public class ApplicationMutation<T> : ObjectGraphType where T: BaseModel
{
    public ApplicationMutation()
    {
        this.Name = "RootMutation";

        var nameofT = typeof(T).GetElementType().Name;

        this.Field<AddPayloadType<T>>(
            "add" + nameofT,
            arguments: new InputQueryArguments<AddInputType<T>>(),
            resolve: context =>
            {
                var input = context.GetArgument<AddInput<T>>("input");

                var result = Activator.CreateInstance<T>();
                {
                    Name = "1337 p40c355I73m";
                };

                return new AddPayload<T>(input, result);
            });

        this.Field<UpdatePayloadType<T>>(
            "update" + nameofT,
            arguments: new InputQueryArguments<UpdateInputType<T>>(),
            resolve: context =>
            {
                var input = context.GetArgument<UpdateInput<T>>("input");

                var result = Activator.CreateInstance<T>();
                {
                    Name = "rul0r item";
                };

                return new UpdatePayload<T>(input, result);
            });

        this.Field<DeletePayloadType<T>>(
            "delete" + nameofT,
            arguments: new InputQueryArguments<DeleteInputType<T>>(),
            resolve: context =>
            {
                var input = context.GetArgument<DeleteInput<T>>("input");

                var result = true;

                return new DeletePayload<T>(input, result);
            });
    }
}

The exception is thrown from the following line: var nameofT = typeof(T).GetElementType().Name;

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