Hi,
Sometimes when I’m trying to read a .mp4 movie, I got this kind of error (randomly, like 1 out of 3) :
Uncaught TypeError: Cannot read property ‘isStopped’ of null
File: sa.js?t=XXXXXX
Line: 16
Any idea ? 
EDIT : it happens in Chrome and Firefox (Ubuntu)
Sorry for the dumb question but… Are you getting the errors in Sublime or just in the browsers?
If they are only in the browsers then it’s likely a bug in you code not in the editor…
Apart from that, with just the console output it’s quite impossible to track the bug, I can say the problem is given by the fact that the script is trying to get a property (isStopped) from a reference that is actually pointing to nothing (you are passing the wrong object reference to the function/method in the script), but then again, why this is happening is impossible to tell…