UnknownError: Attempt to get a record from database without an in-progress transaction

[skyqrose]

My app occasionally gets error reports from clients of UnknownError: Attempt to get a record from database without an in-progress transaction.

It's always on iPhone.

I don't have a stack trace, but it's likely happening in a call to IDB.get(key), though we also call IDB.del(key) nearby.

We're using idb-keyval version 6.2.1.

This isn't a big deal for us, cuz our app just uses IDB as a cache, so we gracefully catch the error and ignore the cache, but I thought I'd submit a bug report anyway in case it matters more to someone else.