Service worker error: Cannot read properties of undefined (reading 'stale')

[lberki]

My guess: the if statement in service_worker.js:105 falls through, even through it should not.

Full trace:

service-worker.js:65 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'stale')
    at service-worker.js:65:27
    at Generator.next (<anonymous>)
    at Function.continuer (service-worker.js:150:31)
    at spawn (service-worker.js:163:10)
    at fetchEvent2 (service-worker.js:59:17)