App Crash in Apple Devices

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We have implemented a Mobile App for students using Visualizer and Mobile Fabric. The Mobile App is in production for Apple and Android for almost 2 years.

But starting from 2019 summer, we received complaints from students who use Apple phones, they said the Mobile App will crash after login.

However, we've tried using iPhones (5,6,SE) with latest iOS version, but we can't simulate the app crash problem.

Usually these students are using iPhone XS or some other new iPhone models.

Since the Push Notification is enabled in our App, we will use the Kony API to get the device ID and register with Mobile Fabric as subscriber.

For example, we use client.getMessagingService() to initiate the messaging client. Then we use kony.os.deviceInfo().deviceid to get the device id. Then we use messagingClient.register(...) to register.

So my questions are:

  1. Did you receive similar app crush cases on those new model iPhones? If yes, what's the usual problem and possible solution?
  2. Did the Kony API have problem to get deviceid from those new model iPhones?

Please advise.

Regards

Any idea on this issue?