Please include as much of the following information as possible to help me fix the bug:

Brief Description of Bug

When i try to BUY any stack of listed items, nothing happens.

Steps to Reproduce

On Buy tab when i try to buy any stack, mini window appears and get scanning (scanning on grey button), after that comes back on main list of searched items, but it doesn't buy anything.
With DEBUG checked, after Atr_Buy_SendQuery i got Atr_Error_Display nil, on next line Atr_GetCurrentPane

Currently i'm on 4.0.17 release on a private server (patch 7.2.5).
Someone got same bug and solved?

Loaded Addons

No addon loaded, only Auctionator to test it.

Back Trace (LUA Error Output)

No LUA errors occurred.