System.NullReferenceException

[AlexeySa]

Overview

ERROR:

System.NullReferenceException: Ссылка на объект не указывает на экземпляр объекта.
   в LockAssist.QuickUnlockKeyProv.RestoreOldMasterKeyInternal(PwDatabase db, IOConnectionInfo ioConnection, QuickUnlockOldKeyInfo quOldKey)
   в System.EventHandler`1.Invoke(Object sender, TEventArgs e)
   в KeePass.Forms.MainForm.OpenDatabase(IOConnectionInfo ioConnection, CompositeKey cmpKey, Boolean bOpenLocal)
   в KeePass.Forms.MainForm.OnFileLock(Object sender, EventArgs e)
   в KeePass.Forms.MainForm.OnFormResize(Object sender, EventArgs e)
   в System.EventHandler.Invoke(Object sender, EventArgs e)
   в System.Windows.Forms.Control.OnResize(EventArgs e)
   в System.Windows.Forms.Form.OnResize(EventArgs e)
   в System.Windows.Forms.Control.OnSizeChanged(EventArgs e)
   в System.Windows.Forms.Control.UpdateBounds(Int32 x, Int32 y, Int32 width, Int32 height, Int32 clientWidth, Int32 clientHeight)
   в System.Windows.Forms.Control.UpdateBounds()
   в System.Windows.Forms.Control.WndProc(Message& m)
   в System.Windows.Forms.Form.WndProc(Message& m)
   в KeePass.Forms.MainForm.WndProc(Message& m)
   в System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Steps to Reproduce

1. Lock DB
2. Unlock DB with PIN

KeePass Version: 2.60
Plugin Version: 3.8.3

There is no such error in version 3.8.1

[Rookiestyle]

Sorry to hear they but unfortunate I cannot reproduce that.
Please provide more details. Unlocking with PIN works just fine for me.

E. g. How is your master key composed? Password? Key file? User account?
Any other plugins installed?

[AlexeySa]

I use a key and a password that contains Russian characters and numbers. The PIN from the "Lock Assist – Quick Unlock" record consists only of numbers.
Plugins: KeeAgnent, KeeAnywhere, KPSimpleBackup.

There are no issues up to and including version 3.8.1. The problem was introduced in versions 3.8.2 and 3.8.3.

The database is stored in S3 storage using the KeeAnywhere plugin.

[Rookiestyle]

I still can't reproduce it.
Please try the attached debug build. It will not solve the issue but it will create a file that hopefully allows me to analyze it better.
Please attach this file

LockAssistDebug.zip