TOEFL Official App for iOS: App crashes if expand map option is pressed

iOS 13.2 on an iPhone 8
TOEFL Official App for iOS (Version 1.2.1)
Date: 11/04/2019

Description:

There is a reproducible crash with the current (1.2.1) version of the TOEFL Official App for iOS.

If the user taps on an expand map option, the app crashes 100% of the time.

Here's an image of the crash dump:

This is easier to show than to describe, so please see the attached screenshots.

Steps to Reproduce:

1. Download the TOEFL Official App for iOS (Version 1.2.1)
2. Launch app - allow location access
3. From the list of "Test Centers Near Me" click on any returned result
4. From the "Select Test Center and Date" screen click on "By Distance"
5. From the Map, click on the map expansion option in the bottom right hand corner of the screen

Result: The Official TOEFL app for iOS will crash if the user taps on a map expansion option

Expected: The Official TOEFL app for iOS should not crash if the user taps on a map expansion option

Launch the app...

Select any location near to you...

Select the "BY DISTANCE" option...

Select the map extender option (indicated by the circle) - the app will crash!