Form not sent form RC login page?

[Pantani]

Hi, does anyone know, how could this happen? See especially the empty _task and _action parameter. The user entered valid username and password, but why he could not login? What happened? I'm using RC 0.7.1.

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Feb  7 08:03:39 iks roundcube: IMAP Error: Login failed for europant from 102.139.104.67. LOGIN: Login failed. in /var/www/webs/roundcubemail/program/include/rcube_imap.php on line 205 (POST /index.php?_task=&_action=)

[Pantani]

And the same here:

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428:Feb  8 14:33:43 iks roundcube: IMAP Error: Login failed for [email protected] from 212.18.1.44. LOGIN: Login failed. in /var/www/webs/roundcubemail/program/include/rcube_imap.php on line 205 (POST /index.php?_task=&_action=)
429:Feb  8 14:34:50 iks roundcube: IMAP Error: Login failed for [email protected] from 212.18.1.44. LOGIN: Login failed. in /var/www/webs/roundcubemail/program/include/rcube_imap.php on line 205 (POST /?_task=login&_action=login)

Why there is once _task and _action set and once not?
I think the user cannot influence this at all.