When building with Xcode 9.1/Swift 4, our production app crashes on load with the following message:

Thread 1: Simultaneous accesses to 0x10391fbb0, but modification requires exclusive access

Initial call where the issue happens is

tableView.addPullRefresh(options:refreshCompletion), which then cascades down to the method mentioned above.

Possibly caused by something similar to this:
Yalantis/PullToRefresh#72