Accessing styleData.index in treeview delegate crashes

If inside Tree view itemDelegate styleData.index is used it is crashing. Same styleData.index outside delegate is not crashing.

Attached example can be used to reproduce:

teps to reproduce: 
1- Uncomment the Accessible.name property that binds to styleData.index; 
2- Comment the Accessible.name property that binds to textItem2.text; 
3 - Build and run; 
4 - Expand a folder that has 2 or more children; 
5 - Collapse the folder.  And Crash