[Bitcoin Wallet] [v1.1.3]The app crashed when I tried to cancel the pin changing process by pressing the back button

Related Information

• Repository: https://github.com/hoanghiephui/Bitcoin-Wallet
• Project Name: Bitcoin Wallet
• My Submitted Issue: Here
• My GitHub Account: Here
• Fixed Commit: here

Expected behavior

I expected that the app would not crash when I canceled the pin changing process by pressing the back button.
I believe the users should be able to press the back button during that encryption process.

Actual behavior

When I tried to change my pin and pressed the back button during that process, then the app crashes immediately.

How to reproduce

Here is every possible detail to reproduce the bug.
1. Download the app from here and open it after install. (You can't produce this bug by installing the latest version from Playstore because the PO has already fixed this issue and updated it to the Playstore. But you can take a look at this bug by downloading from Google drive which is currently installed on my phone)
2. Click on ⋮ (Three dots/ Vertical ellipsis).
3. Then click on "Change Pin Code" and fill these fields with the valid pin. (Set up a pin before try this).
4. Then press "EDIT", and then press the back button immediately and notice the bug.

• App version: 1.1.3
• Operating system: Android 6.0.1

Recording Of The Bug

LogCat

05-17 14:33:31.464 24995 25180 E AndroidRuntime: FATAL EXCEPTION: backgroundThread

05-17 14:33:31.464 24995 25180 E AndroidRuntime: Process: com.bitcoin.wallet.btc, PID: 24995

05-17 14:33:31.464 24995 25180 E AndroidRuntime: java.lang.IllegalStateException: Fragment EncryptKeysDialogFragment{e59cdde} not attached to an activity.

05-17 14:33:31.464 24995 25180 E AndroidRuntime:    at androidx.fragment.app.Fragment.requireActivity(Fragment.java:724)

05-17 14:33:31.464 24995 25180 E AndroidRuntime:    at com.bitcoin.wallet.btc.ui.fragments.EncryptKeysDialogFragment$handleGo$1.run(EncryptKeysDialogFragment.kt:98)

05-17 14:33:31.464 24995 25180 E AndroidRuntime:    at android.os.Handler.handleCallback(Handler.java:739)

05-17 14:33:31.464 24995 25180 E AndroidRuntime:    at android.os.Handler.dispatchMessage(Handler.java:95)

05-17 14:33:31.464 24995 25180 E AndroidRuntime:    at android.os.Looper.loop(Looper.java:148)

05-17 14:33:31.464 24995 25180 E AndroidRuntime:    at android.os.HandlerThread.run(HandlerThread.java:61)