after update4.6.2

Hmm. I haven't worked with 4.6.2 yet. Any hints as to the source of this error would be appreciated.

I did not upgrade but I see the same error with mysql 4.1.11 (latin1) and php 5.0.3 going to drupal/trip_search/advanced shows the following warnings (repeated two times):

warning: Invalid argument supplied for foreach() in /srv/www/html/drupal/includes/tablesort.inc on line 160.
warning: Invalid argument supplied for foreach() in /srv/www/html/drupal/includes/tablesort.inc on line 198.
warning: Invalid argument supplied for foreach() in /srv/www/html/drupal/includes/theme.inc on line 639.

I get the warnings only when entering the advanced search. Hope this helps.

Using Drupal 4.6.2, MySQL 4.1.12 and PHP 5.0.4.
I get exactly the same errors as mr700 when using the advanced search option in trip_search.

I have the same errors as mr700 but when I upgrading drupal there was error:

warning: Invalid argument supplied for foreach() in /database/updates.inc on line 2149

so that ussue can be in drupal, not in trip_search

Am also having the same errors as mr700 in new installation of 4.6.3, reported this in the installation forum as http://drupal.org/node/29809 a few days ago, there is no resolve on that thread either.
Thanks for you assistance.

Looks like the problem is likely related to a change in the parameters for theme_table(), see http://drupal.org/node/22218. In particular:

// Drupal 4.6
theme('table', '', $rows);
// Drupal 4.7
theme('table', array(), $rows);

It looks like this change crept into the 4.6.x upgrades, and that we therefore need to upgrade by changing the line

    $group = theme('table', '', $rows);

in function trip_search_form() to

    $group = theme('table', array(), $rows);

I'm not able to test this right away--can someone confirm if this change solves the issue?

i'm sure that will fix it.

nedjo, the code you gave came out of the code block and with me being a beginner to php I don't want to try it without being 100% sure. What file would the changes need to be done in anyway?

Fix applied to 4.6 and CVS head.