[FIX] Infamous tracker explosion found here: https://dev.tiki.org/item4609 & here: http://tiki.org/forumthread52432 , NOTE: these need to be backported, but first want to confirm with LP

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@53333 b456876b-0849-0410-b77d-98878d47e9d5