Hi Gregory,

My opinion is this:
the problem is on the error routine
( when a error occurs, VFP lost the reference to the this.Treeview, and the countObject it remains unchanged)

try with a variable:

private treeview,NodeExists

NodeExists = TRUE
treeview   = m.this.Treeview

on error NodeExists = FALSE
=treeview.Nodes.Item(m.NodeName)
on error &sError

treeview   = NULL

FABIO