Crash on older iOS devices

My mobile game unexpectedly quits on load. Happens on a every older iOS device I can find, but not on the latest generation. Breaks on iPhone 7 plus, 6S and some version of the iPad Mini.

Works fine on XS Max and 2018 iPad Pro. All of the devices were tested on an earlier version of iOS 12 and then on 12.2.

I don’t have any ambient sounds in the game, but it seems to be asserting on that. If I run the same console filter on the working devices I get no error output, period.

device console log