first zip file uploaded error

[Saiph]

04-13-2014 22:46:36 "..\scripts\ioNiNJA\ioNiNJA.itcl" terminated abnormally
--- ErrorInfo ---
can't read "zip_files": no such variable
while executing
"llength $zip_files"
(procedure "::ioNiNJA::ZipScript::ZipScript" line 119)
invoked from within
"::ioNiNJA::ZipScript::ZipScript 0 [lindex $args 1] [lindex $args 2] [lindex $args 3] "
("CHECK" arm line 1)
invoked from within
"switch -- [lindex $args 0] {
SYMCLEAN { ::ioNiNJA::symlink_clean }
RESCAN { ::ioNiNJA::ZipScript::rescan }
RESOR


when the first zip file is uploaded it is deleted
any ideas on fixing this ? thanks