Yes i know!
as i said what i did was a paliative to solve my specific problem. get access to the system.
Even more, when i was coding i put many "ns_log Notice" and i realized that the API is called many times not only to read that specific mainsite parameter.
But the thing is all the times that the API is called the list has to be even size. That's why my if statement fix the problem and didn't affect other situations and contexts. It fix errors in the list with odd elements
for reference, if Don wants to find the bug it is located at:
file /packages/acs-subsite/tcl/subsite-navigation-procs.tcl
line 70
