Index was out of range. after insert EF Core - postgresql

Question

I am using EF Core to handle my database and I want insert a record to my postgresql database.
But when I insert the record and do the save changes, the app throws an error:
Index was out of range. Must be non-negative and less than the size of
the collection. (Parameter 'index')
I understand that this error can appear when I work with collections but in this case I am doing an insert.
my base entity:
public abstract class BaseEntity: IBaseEntity<long>
{
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
[Key, Column("id", Order = 0)]
public long Id { get; set; }
[Column("createdAt")]
[DatabaseGenerated(DatabaseGeneratedOption.Computed)]
public DateTime CreatedAt{ get; set; }
}
the insert from business layer:
var entityToInsert = new Delivery()
{
State = 1, //active
Date = DateTime.Now,
};
await this.UOW.Delivery.CreateAsync(entityToInsert);
await this.UOW.SaveChangesAsync();
My generic repository method:
public async Task<TEntity> CreateAsync(TEntity entity)
{
await Context.AddAsync<TEntity>(entity);
return entity;
}
the delivery table definition:
id bigint // type identity "by default" autoincrment 1 per 1
state integer
date timestamp without time zone (not null)
createdAt timestamp without time zone (not null)
What am I doing wrong?