Well, ignoring the main problem here, we 
should try to continue ignoring the code 
and/or/except display "node99" (It's good 
to have an universal exit node for 
failure). We can also quit the dialog 
without jumping to any node, which 
dependong on the situation will make 
clear that something happened.

Now, back to main problem ... If I 
understood correctly, the onstacle 
doesn't exists, which imo makes this a 
release-blocker.
You can use the cheat level editor to 
plant it again, or append it here for 
further analysis by other devs.

Hope to have been useful, regards from 
colden brazilian metropolis.
Jesusalva