app crash when enter wrong pin code?

Project Information

Repository:https://github.com/BijoySingh/Scarlet-Notes
Expected behavior:
It should not be denied that an error is entered because of an export note?

Actual behavior
When I enter the correct pin code it can not crash and it works out easily. But when I write the wrong PIN code it crashes.

How to reproduce

download the app

open the app

go to settings and click on

then set a pin code

now click on Backup

then it wants pin to export notes

type a wrong pin code

note the bug

App version: v5.6.0

Recording Of The Bug
Proof of Work Done :
check my profile in-