backend "New Event Registration" process spits out php warnings

Actually form should not submit since "fees" is required field. Formrule is not working for fees. Need to fix that.

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For example go here:

http://sandbox.civicrm.org/civicrm/contact/view/participant?reset=1&action=add&cid=52&context=participant

When the form is submitted, the following warnings are shown:

warning: array_search() [function.array-search]: Wrong datatype for second argument in /var/www/drupal-6.civicrm.org/public/sites/sandbox.civicrm.org/modules/civicrm/CRM/Event/Form/Participant.php on line 617.
warning: array_search() [function.array-search]: Wrong datatype for second argument in /var/www/drupal-6.civicrm.org/public/sites/sandbox.civicrm.org/modules/civicrm/CRM/Event/Form/Participant.php on line 620.

It looks like the registration is successfully created though.