Commented it out. The logs show the error since March 2017.

With the Wikimedia Maps project looking promising, I'm not particularly interested in spending more time on the kmlexport tool. If someone wants to keep working on it, the easiest next steps off my todo list would be to use Perl memory profiling tools to find out where the memory's going, build a simple job dispatcher and run the tool on the grid for each request, use FastCCI for the recursive queries, change it to use FastCGI as it did on the toolserver, and if you must, limit the size of the results.