db_query make wrong table prefix getting

I've iinstalled modulle DOTGO Authentication Module (indeed with DOtgo module)
during installation i had a message:

user warning: Unknown column 'd612_token' in 'field list' query: SELECT d612_token FROM d612_dotgo_auth WHERE uid=1 in /var/www/*/sites/all/modules/dotgo/dotgo_auth.module on line 100.

d612 - table prefix for my installation of Drupal 6.12

and after that looked into code for dotgo_auth.module:

function _get_token($uid) {
<b>$token = db_result(db_query("SELECT {token} FROM {dotgo_auth} WHERE uid=%d", $uid));</b>
  if (!$token) $token = _set_token($uid);
  return $token;
}

and in database.mysql-common.inc:

function db_query($query) {
  $args = func_get_args();
  array_shift($args);
 <b> $query = db_prefix_tables($query);</b>
....

SO in place around $query = db_prefix_tables($query); I've put debug to show queries. So here is results:

SELECT {token} FROM {dotgo_auth} WHERE uid=%d - before

SELECT d612_token FROM d612_dotgo_auth WHERE uid=%d - after

And that is why field is unknown....!!!!

In table d612_dotgo_auth data is existed (SELECT token FROM d612_dotgo_auth WHERE uid=1):
1 ixwzpe
1 YZn6a3
1 zoWJEH

I also have message "You do not have the PHP "dom" extension loaded, this module will not function."

Could it be related with?

or it is really issue with table prefixes?

Is it Drupal originally issue with db_prefix_tables function?
or with dotgo module way of calling this function?