Travis build failing for DexieJS and we are not sure why?

Hi,

We recently did a patch to DexieJS, and now the Travis builds are failing and we are not sure why. This is a link to the travis build:

https://travis-ci.org/dfahlander/Dexie.js

A log of one of the failing jobs:
https://travis-ci.org/dfahlander/Dexie.js/jobs/512355556

Commit log:
https://travis-ci.org/dfahlander/Dexie.js/builds/512355553?utm_source=github_status&utm_medium=notificatio

Please let us know what other information we can provide.

Cheers,
Ole