DELETE ERROR: tuple concurrently updated

[Михаил Кечинов <kechinoff@xxxxxxxxx>]

Hello.

Here is a problem, which I can't understand.

One week ago our database has crashed and after restore begins some problems.

One of them: 

When I try to delete one row from database (for example):

delete from document where numdoc = 901721617

I have this error:

ERROR: tuple concurrently updated

SQL state: XX000

I know, that no one deleting this row at same time.

What's mean this error?

Thanks.

-- 

Mikhail Kechinov
http://www.mkechinov.ru