The item with identity 'Id' already exists in the metadata collection. Parameter name: item

All of my entities have a base class:

public class Entity<TKey> : IEntity<TKey>
{
    dynamic IEntity.Id
    {
        get
        {
            return this.Id;
        }
        set
        {
            this.Id = value;
        }
    }

    public TKey Id { get; set; }
}

For example Status entity:

[MetadataType(typeof(StatusMetadata))]
public partial class Status : Entity<byte>
{
       public string Title { get; set; }
}

When I run the query against the database I get the following error: "The item with identity 'Id' already exists in the metadata collection. Parameter name: item". Is there any way to fix this or it's an issue caused by inheritance and I can't inherit my entities from any class?