Blank page after creating an order in the backoffice

[dannyd]

Hello,

 

I am on Prestashop 1.6.0.14.

 

When I try to create an order in the back-office, I am getting a blank page.

No errors are shown, even though development mode is on.

So I don't even know what causes the problem.

 

Additionally, this happens only if there are any cart rules applied to an order.

If I delete a cart rule, an order is placed normally.

 

I have searched forums for similar problems and tried recommended fixes, but it didn't help.

 

I would appreciate any ideas.

Edited July 23, 2015 by dannyd (see edit history)