Node.JS loads in website using headless webkit library called nightmare, and takes a screenshot. There is a bug though.

I have a script which loads in [login to view URL] on random domain names and runs a speed test. Once the speed test is run, it takes a snapshot of the web browser window, and shoots an email off. The way it does this, is it loads up [login to view URL], enters in the domain to run the speed test on, then submits the form. It then polls the page to wait until the results are finished. I've noticed three problems: 1) Sometimes the screenshot does not get saved. Please try to figure out why. If you can't figure it out, please put in code to retry screenshot saving until the file saves. Here's a sample of what a screenshot looks like: [login to view URL] 2) Sometimes the script starts bugging out, and it'll start polling twice or three times, resulting in 2 or 3 emails being sent out. Obviously this is bad. 3) Sometimes there is uncaught promise rejections -- I'm not sure why, but when you see them please find the reason and fix them. I'm running on OSX 10.11.4 with node 6.9.1 Here is a preview of one of the files. Full set of files, along with sample database dump will be provided to the Node.js developer who wins the job. Thank you! Preview: [login to view URL]