After Crt+Shift+O error pops up

[Graphicmannnnnn]

Hi,

I have updated Illustrator 26.5.3 (64bit).

When I'm trying to convert text to curves the preview change to contour and some error pops up.
Sending screen.

[Monika Gause]

That's Polish, right?

Do you have any other issues with that font? Which font is it?

How much RAM is installed on your computer?

Did you already reboot the computer and try again? Launch only Illustrator, no browser, nothing else.

[Graphicmannnnnn]

Yes that's Polish. It is Raleway font but thanks to your suggestion I have found what the cause of the problem.

I have also Illustrator CS6 and the problem is when I'm copying text from it to the 2022 version.

That text is not compatible with the newer version. This is of course bizarre.

[Monika Gause]

That is indeed weird. On the other hand there have a couple of changes to the text engine since then. The latest one being the introduction of bullet lists.