HTML POPUP "Invalid window handle"

VCL TMS VCL UI Pack
1

Hi,


I am using HTMLPOPUP since years in my projects. 

Now I have an issue with the component, without changing the code.

I have a modal-form with a button-click-event:

  HTMLPopup.Text.clear;
  s1 := "TEXT"
  HTMLPopup.Text.Add(s1);
  HTMLPopup.Show;

This works and I can click the button and show the popup as much as I like.

I leave the form (back to main form) and open it again. Now I get the error on the button-click: 

“System Error. Code: 1400. Invalid window handle”

Any idea? It worked for year. 

HTMLPopup 1.4.2.1 / Delphi Seattle 

Thanks for help!
2

Insufficient information / details.
Cannot be reproduced.
Test code:

http://www.tmssoftware.net/public/HTMLPopupModalForm.zip