Contacts stops when I try to add any contact on this simple contact app

Expected behavior

App should be able to add any contact on contact list, as we expected that app should be able to add any contact.

Actual behavior

When I try to create a new contact through this simple contacts app. Contact keep stopping no response at all.

How to reproduce

• Download the app
• install the app
• open the app
• open contacts
• add any number then click on create a new contact
• complete action through contacts and app stops

• App: Simple contacts v 3.5.2
• Operating system: mi A1 8.0 "Oreo"

Recording Of The Bug