"Delete selected" from List page doesn't wor

Hi,
I'm using PHPRunner 5.0 and on a project I am testing I found that the "Delete Selected" button on the list page doesn't do anything.
When clicked, I do get a prompt asking me whether I really want to delete the records but when clicked OK to accept, the record is still there.
On Firefox and Opera, no error is shown.
On IE browser I am getting this error:
Line: 449

Char: 4

Error: Object doesn't support this property or method

Code: 0

URL: http://localhost:81/Support/customer_list.php?a=search&value=1&SearchFor=TEST+delete&SearchOption=Contains&SearchField=
Any advice you can provide would be greatly appreciated. Thanks.