error bug 1790

[Rikoairlan57]

Welcome! Please use this template for reporting bugs or requesting features. For questions about using Workbox, the best place to ask is Stack Overflow, tagged with [workbox]: https://stackoverflow.com/questions/ask?tags=workbox

Library Affected: workbox-sw, workbox-build, etc.

Browser & Platform: E.g. Google Chrome v51.0.1 for Android, or "all browsers".

Issue or Feature Request Description: Your request here.

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