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Invalid operand to 'in': Object expected #912
It seems like this change made in v3.15.0 broke some functionality on IE 10 and lower. Downgrading to v3.14.2 resolved the issue.
This may have something to do with the caveat listed on Babel about the use of
The specific error we received (in the title) and full stack trace we received via Honeybadger is available here: