Cordova fires a pause event when the app is put into the background, but this error is thrown from within patchViaCapturingAllTheEvents():

It looks as though event.target is null:

This only happens on Cordova's pause event, but is not a problem with the others:
https://cordova.apache.org/docs/en/latest/cordova/events/events.html#pause