Crashing on iOS

When upgrading from one app version to another on iOS, We encounter a very frequent crash in (SIGABRT ABORT 0x00000001825352e0)

I assume this is bug relates to upgrading from a version built with Unity 2017 to a version built with Unity 2018, as new installs do not see this crash. Does anyone know what this could be?

A few details:

It seems most prevalent on os version 11.4.1
There are several devices that have the most crashes - iPhone 6s and iPad Air to name two of them.

Any help would be greatly appreciated.

Did you find an answer to this issue? We’re seeing the same kind of crashes in Crashlytics for our latest release, built with Unity 2018.2.6f1

I haven’t been able to connect the issues to being just for upgrades though, not sure how I could see that in Crashlytics. Do you know if the users experiencing this bug are able to run the app the next try after it has crashed or do they need to reinstall the app?