Error when try to close right of tabs (containing wpf's xaml file opened in tab)

[Paw2Pom]

Installed product versions

• Visual Studio: 2019
• This extension: 1.4

Description

When I try to perform "Close tabs to the right", if any of tabs contain the WPF's xaml file opened, than an error of 'Object reference not set to an instance of an object' will be displayed.

Steps to recreate

1. Create an WPF project
2. Open the xaml file
3. Open any other tabs, so make the xaml file to the right side
4. Try to close the xaml file using 'Close tabs to the right'

Current behavior

as above.

Expected behavior

no error message displayed and the xaml file tab can be closed.