[Plugin: MailPress] Database error, Mail not saved

HI,

I’m using V5.2.1 and when someone try to register to my newsletter, I’ve got this error message :

2012-01-01 17:29:15 000000 --  **** Start logging **** mp_mail *** level : 1 **** (5.2.1) **** /wp-content/plugins/mailpress/mp-includes/action.php
2012-01-01 17:29:15 000000 -- MAILPRESS [NOTICE] - :::: external recipient ::::
2012-01-01 17:29:15 000000 -- **** Empty user/password for SMTP connection ****
2012-01-01 17:29:15 000000 -- MAILPRESS [NOTICE] - Disconnecting from wp-scoffoni (MP_Mail)
2012-01-01 17:29:15 000000 -- MAILPRESS [NOTICE] - Disconnected (MP_Mail)
2012-01-01 17:29:16 000000 -- MAILPRESS [NOTICE] - Connecting to wp-scoffoni (MP_Mail)
2012-01-01 17:29:16 000000 -- MAILPRESS [NOTICE] - Connected (MP_Mail)
2012-01-01 17:29:16 000000 -- MAILPRESS [ERROR] - *** Database error, Mail not saved :
UPDATE <code>1845ap_mailpress_mails</code> SET <code>status</code> = '', <code>theme</code> = '', <code>themedir</code> = '', <code>template</code> = '', <code>fromemail</code> = '', <code>fromname</code> = '', <code>toemail</code> = '', <code>toname</code> = '', <code>charset</code> = '', <code>subject</code> = '', <code>html</code> = '', <code>plaintext</code> = '', <code>created</code> = '', <code>created_user_id</code> = 0, <code>sent</code> = '', <code>sent_user_id</code> = 0 WHERE <code>id</code> = 0
2012-01-01 17:29:16 000000 --  **** End   logging **** mp_mail *** level : 1 **** status : FALSE

The person receive the email but got an error message when confirm the inscriptions saying
ERREUR # 5 (abonné inconnu) !

Any idea ? Thanks for your help

http://wordpress.org/extend/plugins/mailpress/