Migration DB: Specified Open Polls are displayed and behave as closed

How to check:
Find somehow the poll without ending date on old forum (usually FAQs and other sticked posts)
Open the same poll on JCommune

Actual result:

• Poll is displayed as closed
• "Voting stops at" date is the same as CREATED_DATE

Expected result:
All open polls from old forum are displayed as open on JCommune

Data examples:
http://javatalks.jtalks.org/jcommune/topics/12689
http://javatalks.jtalks.org/jcommune/topics/11854

Query run over DB installed 2012-09-05 17:34:18
select *
from POLLS
where ENDING_DATE is null;
/* 0 rows affected, 0 rows found. Duration for 1 query: 0,047 sec. */