Spiderable + Sitemap CPU 100% Error

Have ongoworks:spiderable + gadicohen:sitemaps packages and sometimes when server create sitemap It display this error and I have CPU with 100% usage.

Never seen this before.
Any solutions?

spiderable: phantomjs failed: Error: Command failed:
at ChildProcess.exithandler (child_process.js:658:15)
at ChildProcess.emit (events.js:98:17)
at maybeClose (child_process.js:766:16)
at Socket. (child_process.js:979:11)
at Socket.emit (events.js:95:17)
at Pipe.close (net.js:466:12)
stderr:
spiderable: phantomjs failed: Error: Command failed:
at ChildProcess.exithandler (child_process.js:658:15)
at ChildProcess.emit (events.js:98:17)
at maybeClose (child_process.js:766:16)
at Socket. (child_process.js:979:11)
at Socket.emit (events.js:95:17)
at Pipe.close (net.js:466:12)
stderr:
Error: spawn ENOMEM
at errnoException (child_process.js:1011:11)
at ChildProcess.spawn (child_process.js:958:11)
at exports.spawn (child_process.js:746:9)
at Object.exports.execFile (child_process.js:628:15)
at Object.Package [as handle] (packages/ongoworks_spiderable/packages/ongoworks_spiderable.js:141:1)
at next (/opt/wolfy/app/programs/server/npm/webapp/node_modules/connect/lib/proto.js:190:15)
at packages/gadicohen_sitemaps/packages/gadicohen_sitemaps.js:71:1
Error: spawn ENOMEM
at errnoException (child_process.js:1011:11)
at ChildProcess.spawn (child_process.js:958:11)
at exports.spawn (child_process.js:746:9)
at Object.exports.execFile (child_process.js:628:15)
at Object.Package [as handle] (packages/ongoworks_spiderable/packages/ongoworks_spiderable.js:141:1)
at next (/opt/wolfy/app/programs/server/npm/webapp/node_modules/connect/lib/proto.js:190:15)
[IP address] at packages/gadicohen_sitemaps/packages/gadicohen_sitemaps.js:71:1
Error: spawn ENOMEM