Last Updated: 30 Jun 2023 12:58 by ADMIN
Release R2 2023 SP1
Created on: 26 Jan 2023 12:49
Category: ListBox
Type: Bug Report
TypeError: Cannot read properties of null in ListBox when EnableMarkMatches is true

In our application we use ListBox with property EnableMarkMatches set. When we enter a search criteria with the keyboard you see in the selected rows the search criteria Bold. (See attached screenshot)

When u click with the mouse on this bold search criteria you get an error message in the console of the browser:


RadListBoxScripts.js:1223 Uncaught TypeError: Cannot read properties of null (reading 'get_enabled')

    at c.RadListBox._onClick (RadListBoxScripts.js:1223:6)

    at HTMLLIElement.<anonymous> (RadListBoxScripts.js:476:4)

    at HTMLDivElement.dispatch (jQuery.js:3:12445)

    at r.handle (jQuery.js:3:9174)


This issue is reproducible at

Attached Files:
1 comment
Posted on: 30 Jun 2023 12:58

Hi Hans,

Thank you for reporting this bug!

I have good news the issue will be fixed in the upcoming R2 2023 SP1 release, scheduled for July 19.

As a small note of gratitude for reporting it, I also updated your Telerik points.

Progress Telerik

Heads up! Telerik UI for ASP.NET AJAX versions for .NET 3.5 and 4.0 are retired. Progress will continue shipping assemblies compatible with .NET 4.5 and later. See whether this affects your apps in this article.