igxButton/igxIconButton throw TypeError: Cannot read properties of undefined (reading 'unsubscribe') in SSR

[RivaIvanova]

Description

If you have an igxButton or igxIconButton inside an SSR project, either of them throws TypeError: Cannot read properties of undefined (reading 'unsubscribe').

<button igxButton="flat">Button</button>

<button igxIconButton="flat">
  <igx-icon>home</igx-icon>
</button>

Related to https://infragistics.visualstudio.com/Indigo_Platform/_workitems/edit/36904#13216343

• igniteui-angular version: 20.1.x, 21.0.x, master
• browser: any

Steps to reproduce

1. Create an SSR project
2. Add an igxButton or igxIconButton
3. Run the project

Result

Expected result

No errors

Attachments

Attach a sample if available, and screenshots, if applicable.