Got an error while registering, although I could still register

Hi everyone, I just got some error while registering:

Fatal error: Existing data passed is not an array
Called set_existing in /home/sites/forums.digitalpoint.com/web/register.php on line 385
in /includes/class_dm.php on line 235

Code (markup):

Now, I simply logged in again, and sent confirmation email again, and then was able to register.

Is it a bug at digitalpoint Or maybe a bug on my pc

I thought of telling it to other people so that digitalpoint may fix it.