Check the structure of your table:
znc_customers_info

IF it matches this one, run this in the SQL:
Code:
DROP TABLE IF EXISTS znc_customers_info;
CREATE TABLE znc_customers_info (
  customers_info_id int(11) NOT NULL default '0',
  customers_info_date_of_last_logon datetime default NULL,
  customers_info_number_of_logons int(5) default NULL,
  customers_info_date_account_created datetime default NULL,
  customers_info_date_account_last_modified datetime default NULL,
  global_product_notifications int(1) default '0',
  PRIMARY KEY  (customers_info_id)
) ENGINE=MyISAM;