error: 'NoneType' object is unsubscriptable

This is the bug trace, that started long race of same errors:

----------------------------------------------------
Chyba: Při stahování e-mailu došlo k chybě
Ignoruji tuto chybovou zprávu
Pokud chcete, nahlašte následující výpis na www.gmail-backup.com/forum
Děkujeme. (gmb.py revize 691):
Traceback (most recent call last):
File "gmb.pyo", line 1138, in iterMails
File "gmb.pyo", line 679, in fetchMessageId
File "gmb.pyo", line 689, in fetchMessage
TypeError: 'NoneType' object is unsubscriptable
----------------------------------------------------

Following this error, in saved ZIP archive with mail there were several files named after date, that doesn't exist. Like
1970_04_19700404-153133-time_europe@customersvc_com-TIME_EUROPE_Magazine_Cancellation_Confirmation-1.eml

Or I was first one with Gmail account in 1970ties :)

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I'm getting the NoneType error too

Once I get this error, the backup of the rest of my messages generate the same error - here is the first traceback of many:

Stored 100.0%: newsletter@my.trnewsletter.com - Emerging Technologies Monday Update (3/30/2009)
Error: Error occured while downloading e-mail
Ignoring this error message.
If you want, please report the following traceback at www.gmail-backup.com/forum
Thanks! (gmb.py revision 691):
Traceback (most recent call last):
File "gmb.py", line 1138, in iterMails
File "gmb.py", line 679, in fetchMessageId
File "gmb.py", line 689, in fetchMessage
TypeError: 'NoneType' object is unsubscriptable