Can not delete customer with more than 1 address entries.

Version: 1.3..8a

Im not even sure if this is a bug, but here goes: I was trying to delete my test account (which accidentally has more than 1 address entries.) I clicked delete and confirmed, the page reloads but nothing happens.

Something else is very weird as well: I clicked on edit and the account info is blank. (The info is there in the db tho, checked)

I re-uploaded customers.php but that still did work for me.

(I'm willing to give more server login if someone in the dev team want to check it out.)

Regards

On my fresh v1.3.8a site, I just set up another customer, and added 3 addresses to it. I confirmed their existence in the admin by clicking on the "1 of 3" link.

Then I went to the admin and clicked on that customer. Then clicked the Delete button, then confirmed it.
Poof. All gone. Customer. Addresses. All is appropriately cleaned-up.
No errors.

What's unique about the site you're experiencing this on?

Let me think. I did not install this site myself so I'm not really sure which add-ons they used. However, I checked again and found 1 interesting thing:
When I click on a customer name, the url on the address bar is:
customers.php?search=blah&origin=index&page=1&cID=4&page=1
(which is correct)

However, the buttons on the right handside will lead to links like this:

customers.php?search=blah&origin=index&page=1&cID=&action=edit

You can notice that the cID is missing. Weird.