I was getting the same error while running the app on iOS 14.1 (xCode 12).
Error:
Fatal error: Can't remove first element from an empty collection: file Swift/RangeReplaceableCollection.swift, line 624
Possible cause:
Apple might have changed how the app behaved in multithreaded environment.
What I had done:
I was making array of some model classes in synchronous main queue. But using that array in a different thread.
What I changed to make it work:
Now, I am using that array in the same thread it was being appended in.
Hope this helps.
Bharat1Juneja
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