1. What version of bluebird is the issue happening on?
   Current

2. What platform and version? (For example Node.js 0.12 or Google Chrome 32)
   Google Chrome 56.0.2924, on Windows

3. Did this issue happen with earlier version of bluebird?
   I'd think so

I'm seeing this error very rarely, and I think there is probably something else wrong with that browser, but it's easy to fix.

The error happens in setBounds, https://github.com/petkaantonov/bluebird/blob/b7f21399816d02f979fe434585334ce901dcaf44/src/debuggability.js

firstLineError.stack or lastLineError.stack is undefined.

if (!longStackTracesIsSupported() || !firstLineError.stack || !lastLineError.stack) return;

or

var firstStackLines = (firstLineError.stack || '').split("\n");
var lastStackLines = (lastLineError.stack || '').split("\n");

should fix it.