Can't save a number from the app to my phone as a contact

Project Information

Repository: https://github.com/moezbhatti/qksms

Project Name QKSMS

The issue Submitted on Github: https://github.com/moezbhatti/qksms/issues/1448#issuecomment-503466201

My Github Link: https://github.com/iamowomizz

DESCRIPTION
When I try to save a number as a contact on my phone from the app, it says cannot save invalid number

STEPS

1. Open the app

2. Open a message you sent to a number not saved on the phone

3. Click on the three vertical dots at the top of the app by the side of the call logo

4. Click on the number to save as contact on phone

EXPECTED
When I click on the number to save as a contact on my phone, I expect the number to be saved on my phone

OBSERVATIONS
When I click on the number to save as a contact in my phone it just says cannot save invalid number

Screen recording

Devices and Versions

Device: (Infinix s2pro)
Version (7.0)
App version (3.6.4)