iOS app crash with UICheckBox, drawLayer:inContext

I recently published an iOS app, the app has around 1000 downloads now and I just had my first crash (I use Firebase Crashlytics).

I'm not sure I understand correctly this crash report, here is a screenshot : (iPhone Xr iOS 13.1.3, the (Manquant) in the screenshot means (Missing))

Here is my code in UICheckBox.swift line 16 : (I use UICheckBox_swift library)

Any idea how I can protect my app from this crash event ? Is this a system bug that I can't do anything about ?

Thanks