SQLSTATE[42000] Error importing users from xml file.

I'm trying to import users from an xml file.
The file is simple, name, surname, address, mail, ecc..
The debug of import permits me to see that the data are, in effect, correct. However, when data must be entered on mysql, I get an error:
SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' 'test1@test.com'' at line 1
I don't understand why!
My mapping proccessor:
xpathparser:0 User name
xpathparser:1 e-mail address

In import I set:
Context: //users//items
Username: //users//items//super002//surname
Mail: //users//items//emails//mail

User name missing or email not valid.
Original item

array (
  'xpathparser:0' => 
  array (
    0 => 'username1',
    1 => 'username2',
  ),
  'xpathparser:1' => 
  array (
    0 => 'test@test.com',
    1 => 'test1@test.com',
  ),
)

Entity

stdClass::__set_state(array(
   'uid' => 0,
   'roles' => 
  array (
  ),
   'status' => '1',
   'feeds_item' => 
  stdClass::__set_state(array(
     'entity_id' => 0,
     'entity_type' => 'user',
     'id' => 'isis_import',
     'feed_nid' => 0,
     'imported' => 1319019203,
     'hash' => '0c3eeb52d1d05a9b22b7bc4688621cff',
     'url' => '',
     'guid' => '',
  )),
   'created' => '1319026403',
   'name' => 
  array (
    0 => 'username1',
    1 => 'username2',
  ),
   'mail' => 
  array (
    0 => 'test@test.com',
    1 => 'test1@test.com',
  ),
))