Hi,
in my nextjs 10 application, I have code like (the only place where a toolbar is applied):
import { RichTextEditorComponent, Inject, Toolbar, Image, Link, HtmlEditor, QuickToolbar } from "@syncfusion/ej2-react-richtexteditor"
<RichTextEditorComponent value={model?.body} name="body" toolbarSettings={toolbarSettings}>
<Inject services={[Toolbar, Link, HtmlEditor, QuickToolbar, Image]} />
</RichTextEditorComponent>
But as soon as I navigate to any other page, the following error occurs in Firefox:

In Chrome, the error looks a bit different:
Unfortunately, I cannot reproduce this in a small example. I hope you can find the problem with these error details.
Syncfusion version 19.1.69.
Maybe related to https://www.syncfusion.com/forums/158868 although there is no grid involved.
Best regards, Steffen Harbich