Phantom crashes after 222 page crawls

Question

I have an array of 262 links within a site. I am using Phantom in a NodeJS server to crawl each of these pages to create HTML snapshots. I am finding after the 222nd page, phantom crashes with the following error:

phantom stderr: 2015-06-10 11:44:20.159 phantomjs[4474:58792] Critical failure: the LastResort font is unavailable.

This has happened twice now, and is a real pain as it takes quite a while for it to crawl this many pages. For the record, when I had less pages, I never came across this issue, and for the first 222 pages there are no errors, so I don't think the issue is with my current code. However I will happily post some if anyone thinks it will be useful to help me solve this problem.

My initial assumptions are it is either a bug in phantom, something to do with a maximum number of pages allowed to be crawled, or a setting I can/should add to my instances of phantom.

I found someone with the same problem which didn't get solved here: https://groups.google.com/forum/#!topic/casperjs/KpDisQL7wxs

The code looks like this:

var crawlPage = function(arr, idx){


  // start/end crawl
  // --------------------------------

  if (!idx) idx = 0;
  if (idx >= arr.length) return;
  else if (idx === 0) console.log("Starting page crawl");


  // visit page
  // --------------------------------

  phantom.create(function(ph){
    ph.createPage(function(page){
      page.open(arr[idx], function(status){

        //error accessing page
        if (status !== "success") return console.log("Unable to access page");

        //wait 4s for page to render
        setTimeout(function(){

          //evaluate page html
          page.evaluate(function(){ 
            return document.all[0].outerHTML;
          }, function(snapshotHTML){

            //strip script tags from html
            snapshotHTML = snapshotHTML.replace(/<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi, "");

            //save snapshot to file
            saveSnapshot(arr[idx], snapshotHTML); //save snapshot file

            //crawl next page
            crawlPage(arr, idx+1);

            //exit page
            ph.exit();

          });

        }, 5000);

      });
    });
  });

}

var siteLinks = [/*array of 262 links*/];
crawlPage(siteLinks);