Solving blank screen problem on receiving phone calls

I'm Using the Lava mobile of the Android 10 operating system and my mobile started to show a black screen when I receive phone calls so I am unable to answer the phone call because no answer button is displayed. 

Note: Truecaller application is already installed on my mobile.

So I tried a lot to fix this problem and this worked for me

* Fixed on 12th March by creating a new user and I have called my number in that new user account and it worked fine.

So I came back to my original user account and again I have please tell incoming call and it worked fine 😁

And now this issue is solved for me 👏👏👏

And again when I received a phone call again blank screen is displayed. So I thought that the problem is not yet fixed and started again to fix it.

Final working fix

* I changed the default phone application to the Truecaller app, I called my number and I changed back to the default system again keeping the new user account unchanged.

It worked fine for a few days and after the same problem is repeated, so the same solution is repeated by me to change the default phone app.

It's working fine until today 21st March 2022 🙂👏