Migration from jComments: Can't move more than comment

Hello.
I use jComments 3.0.0 on latest Joomla 2.5 and would like to migrate all comments to great Komento, but have some problem.

I use jComments for joomla articles and Community Polls (but, seems that doesn't matter).

I navigate to "Migrators > JComments" and select 2 components (also I tried with single component: articles or CPolls only). Set different "Publishing State" ("inherit" or "publish all") with and without "Migrate Likes".

After I press "Start Migration" button, I can see 4 action in logs:

[21:22:38] Getting statistics
[21:22:38] Total components to migrate: 1
[21:22:38] Total articles with comments to migrate: 1246
[21:22:38] Total comments to migrate: 3411

but Progress is always 0%. Statistic display:

Total articles 1246
Total comments 3411
Migrated comments 0 / 3411

When I navigate to "Comments Management" I can see only one comment migrated. Something stuck.

Does anyone had this issue before?
I posted "Site Details", can you please look at it? Can't wait I can start to use Komento