clicking send relationship request link twice results in errors

Hi,

I clicked the Send Relationship Request link and the page was taking awhile to load so I clicked it again. I received the below errors:

- warning: array_fill() [function.array-fill]: Number of elements must be positive in /srv/www/example.com/public_html/includes/database.inc on line 253. 
- warning: implode() [function.implode]: Invalid arguments passed in /srv/www/example.com/public_html/includes/database.inc on line 253. 
- warning: array_keys() [function.array-keys]: The first argument should be an array in /srv/www/example.com/public_html/modules/user/user.module on line 513. 
- user warning: 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 ')' at line 1 query: SELECT p.perm FROM role r INNER JOIN permission p ON p.rid = r.rid WHERE r.rid IN () in /srv/www/example.com/public_html/modules/user/user.module on line 513.

Can someone please help so that users do not receive this scary error when the send relationship link is clicked more than once.

Thank you!