Contacts app automatically closes while adding new contact on MacBook Pro

For some reason, if I try to add a new contact, as soon as I start entering someone's name or number, the window closes before I have had a chance to enter the full contact info, and then shows up as no name in my contact list.

Thank you-

Sequoia 15.5

[Re-Titled by Moderator]

Original Title: Can't enter new contacts