PDF24 crashes on Terminalserver when sending pdf as mail

Why PDF24 keeps crashing after sending a pdf directly as a mail?

Hello,

after printing a PDF file I click on save in the PDF24 dialogue everything is fine.

If I click on send as Email the Email (Outlook) opens and the PDF is attached to it.
I can send it - the mail is fine and the pdf file is included.
But after sending the PDF24 crashes.
This happens everytime. Only workaround for now:

Either save and attach the file by hand or send as mail directly and click multiple times on the [X] until windows asks for the programme to force-quit.

I need to convert ~100 documents a day so doing the extra step with saving a file and attach it by hand or force-quit the application takes too much time.