Error message when creating new fields.

Hello together,

i have the following misstake in my durpal installation when I create e new field.

    * warning: Illegal offset type in isset or empty in /srv/wwwroot/kunden/webs/web1/PPS_DRUPAL6_PROD_TEST/includes/path.inc on line 65.
    * warning: mysqli_real_escape_string() expects parameter 2 to be string, array given in /srv/wwwroot/kunden/webs/web1/PPS_DRUPAL6_PROD_TEST/includes/database.mysqli.inc on line 323.
    * warning: Illegal offset type in /srv/wwwroot/kunden/webs/web1/PPS_DRUPAL6_PROD_TEST/includes/path.inc on line 70.

The field is created and still works well so far.
The error, however, I would quite like to remove them.

The both lines in the path.php are the following:

65: if (isset($map[$path_language][$path])) {

70: $map[$path_language][$path] = $alias;

tha a lot!

mfG Oliver