1.4.0 Unrecognized selector crash

[nickenilsson]

We are getting a unrecognized selector crash in the new version:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[PeachCollectorEvent sendEventWithType:eventID:properties:context:metadata:]: unrecognized selector sent to class 0x102fdb420'

This is what the crashing call looks like from our side:
PeachCollectorEvent.send(withType: .init(rawValue: "media_end"), eventID: event.metaData.itemId, properties: properties, context: context, metadata: event.metaData.peachMetaData)
where event.metaData.itemId has type String, and event.metaData.peachMetaData has type [String: NSCopying]