Button in Backup Schedule not working in IE

Virtualmin Theme version: 6.4
Virtualmin version: 3.63
Operating system: Debian Linux 4.0
When I go to "Backup and Restore" > "Scheduled Backups", then select a backup and try to edit the "Scheduled backup time" by clicking on the "..." button, nothing happens in IE due to a javascript error.

Webpage Script Errors

User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; Media Center PC 6.0; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Zune 3.0)
Timestamp: Fri, 12 Dec 2008 16:09:04 UTC

Message: Invalid argument.
Line: 411
Char: 62
Code: 0

In Firefox though the button works fine.

Closed (fixed)