Error when calling close()

[philipwalton]

I store a reference to the sauce connect process in my build setup so I can close it when my tests are done, but recently I've been getting this error every time I run it:

/Users/philipwalton/Projects/xxx/xxx/node_modules/sauce-connect-launcher/lib/sauce-connect-launcher.js:564
    var tunnelId = child.tunnelId;
                        ^

TypeError: Cannot read property 'tunnelId' of null
    at ChildProcess.child.close (/Users/philipwalton/Projects/xxx/xxx/node_modules/sauce-connect-launcher/lib/sauce-connect-launcher.js:564:25)
    at process.on (/Users/philipwalton/Projects/xxx/xxx/gulpfile.js:203:42)
    at emitOne (events.js:101:20)
    at process.emit (events.js:188:7)
npm ERR! Test failed.  See above for more details.

Let me know if you need any more information from me.