Segfault when using menuprint

I get a segfault when clicking on a menu item with this command:

echo -e "^fg(yellow)menu^fg()\none\ntwo\nthree\nfour\nfive\nsix\n" | ./dzen2 -l 7 -x 400 -y 200 -w 200 -p -m -e 'onstart=uncollapse;button1=menuprint'

From what I can see the crash is happening at line 458 in action.c

That's as far as I've been able to figure it out so far.