webdriver io crashes inside a jade template on rendered function - meteor

Question

I am testing my meteor app's UI with some browser tests. I use http://webdriver.io and a selenium chrome https://hub.docker.com/r/selenium/standalone-chrome/ node.
I use the webdriver.io testrunner for tests and mocha as the test framework.
When I enter this block inside a jade template (by opening the corresponding page):
Template.boardBody.onRendered(function() {
let imagePath = new ReactiveVar('');
this.autorun(() => {
imagePath.set(Meteor.settings.public.backgroundPath[1]);
//document.getElementsByClassName('board-wrapper')[0].style.backgroundImage = "url('" + imagePath.get() + "')";
$('.board-wrapper').css('background-image', "url('" + path + "')");
});
}
The headless chrome crashes with this error:
{ Error: An unknown server-side error occurred while processing the command.
at BoardPage.open (tests/board.page.js:20:5)
at Context.<anonymous> (tests/board.test.js:22:17)
at Promise.F (node_modules/core-js/library/modules/_export.js:35:28)
at execute(<Function>) - at BoardPage.open (tests/page.js:11:13)
message: 'unknown error: session deleted because of page crash\nfrom tab crashed',
type: 'RuntimeError',
screenshot: 'Just a black page',
seleniumStack:
{ status: 13,
type: 'UnknownError',
message: 'An unknown server-side error occurred while processing the command.',
orgStatusMessage: 'unknown error: session deleted because of page crash\nfrom tab crashed\n (Session info: chrome=59.0.3071.115)\n (Driver info: chromedriver=2.30.477691 (6ee44a7247c639c0703f291d320bdf05c1531b57),platform=Linux 4.4.4-200.fc22.x86_64 x86_64) (WARNING: The server did not provide any stacktrace information)\nCommand duration or timeout: 4.13 seconds\nBuild info: version: \'3.4.0\', revision: \'unknown\', time: \'unknown\'\nSystem info: host: \'f362d8ab8951\', ip: \'172.17.0.1\', os.name: \'Linux\', os.arch: \'amd64\', os.version: \'4.4.4-200.fc22.x86_64\', java.version: \'1.8.0_131\'\nDriver info: org.openqa.selenium.chrome.ChromeDriver\nCapabilities [{applicationCacheEnabled=false, rotatable=false, mobileEmulationEnabled=false, networkConnectionEnabled=false, chrome={chromedriverVersion=2.30.477691 (6ee44a7247c639c0703f291d320bdf05c1531b57), userDataDir=/tmp/.org.chromium.Chromium.NUsUeZ}, takesHeapSnapshot=true, pageLoadStrategy=normal, databaseEnabled=false, handlesAlerts=true, hasTouchScreen=false, version=59.0.3071.115, platform=LINUX, browserConnectionEnabled=false, nativeEvents=true, acceptSslCerts=true, locationContextEnabled=true, webStorageEnabled=true, browserName=chrome, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true, unexpectedAlertBehaviour=}]\nSession ID: f1e261ec57fde3697e98945af051d236' },
shotTaken: true }
I use chai.expect for my assertion statements and i have a feeling that the promises are somehow messing up the headless chrome.
Anyone knows why this is happening?