Error when I say 'trade' to a NPC

[danick10]

I get a strange debug assertion when trade windows open and can't figure out why! I'm using tibia 8.6 openGL and tfs rev 5885 for 8.6, I really dont understand! Every time the trade windows appear the client crashes!

 

[absoluten]

in all npcs?

 

[danick10]

yes every npcs