Puff password manager App crash when trying to generate long password.

PROJECT INFO
Repositories:
https://github.com/PuffOpenSource/Puff-Android
App name: puff password manager
Link download:
"Puff Password Manager"
https://play.google.com/store/apps/details?id=sun.bob.leela

EXPECTED BEHAVIOR
The users should be able to generate a long password to make more security on this app.

ACTUAL BEHAVIOR
when trying to generate a long password about ten digits then the app getting crashed clearly.

HOW TO REPRODUCE
● Install the app on playstore
● open the app and just fill some required in there
●then trying to generate password about ten digits
●and the app getting crashed
Browser: puff password manager version: 1.2
Device info: android 7.0

BUG RECORDING

PROOF OF WORK DONE
https://github.com/PuffOpenSource/Puff-Android/issues/19
Github.com/dzami

LOGCATS

Process: sun.bob.leela, PID: 16517
java.lang.NumberFormatException: Invalid int: "12345678910"
    at java.lang.Integer.invalidInt(Integer.java:138)
    at java.lang.Integer.parse(Integer.java:413)
    at java.lang.Integer.parseInt(Integer.java:367)
    at java.lang.Integer.parseInt(Integer.java:334)
    at java.lang.Integer.valueOf(Integer.java:525)
    at sun.bob.leela.ui.fragments.SecureStepIntro.getLength(SecureStepIntro.java:36)
    at sun.bob.leela.ui.activities.PasswordGenActivity.willLeaveSlide(PasswordGenActivity.java:113)
    at com.heinrichreimersoftware.materialintro.app.IntroActivity.nextSlide(IntroActivity.java:219)
    at com.heinrichreimersoftware.materialintro.app.IntroActivity$2.onClick(IntroActivity.java:197)
    at android.view.View.performClick(View.java:4791)
    at android.view.View$PerformClick.run(View.java:19884)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5376)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:947)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:742)```