I've solved the problem, i had another call to my fonction that return nil for pfont.
Thanks at all.

Hello I have an error that i dont understand. I'm developing a GUI and I have a problem when I try to pass a filename as a parameter. I wrote my function like this: GUI.addCheckbox(px,py,pw,ph,pcolor,pborderSize,pborderColor,pshape,ptext,pfont,ptextsize) local cb ={} .... cb.text = {} cb.text.font =...