Web version of TTMSFNCMemo.FindNext crashes when none found

Running the FindNext method of TTMSFNCMemo on the Web version crashes with a Javascript error when the term searched for does not exist in the document.

To see this error, run the Web version of the demo for TTMSFNCMemo and enter a string that is not in the example document. I use the default Microsoft Edge browser for the web debug runs.

Thanks!