Sinds de upgrade naar os Monterey krijg ik een popup met de melding dat de endpointsecurityformac onverwacht gestopt is en deze popup verdwijnt niet. In het pad wordt verwezen naar Bitdefender en deze staat niet op mijn mac en heb ik er zelf nietgeze

Apple will not be providing a fix for this.

First make certain to use the Un-Installer procedure from Bit Defender (link above), in case part of Bit Defender got installed by accident. after removing anything, restart your Mac.

If the pop-up occurs AFTER you open a browser, you may simply be seeing a bogus warning, provided by ads on a web site. There is nothing to do in that case except do not go back to that web site.

If the Pop-up occurs BEFORE you open a browser, then you may have adware. You may need a third-party Virus remover. The one Mac uses respect is called MalwareBytes. Download the trial version ONLY from the maker's site, NEVER from any other site.

Zet hem even in het Engels dan begrijpen ze het beter in de wereld.

Translated:

Since the upgrade to os Monterey I get a popup after startup 

with the message that the endpointsecurityformac has stopped 

unexpectedly and this popup does not disappear. The path 

refers to Bitdefender and it's not on my mac and I didn't put it 

there myself.

According to that crash report, YOU DO have at least part of Bit Defender installed, AND it crashed.

You may not have intended to Install it.

Either follow the advice for Bit Defender un-installer, or use the references in that crash report to remove:

/Library/Endpoint/

and everything in that folder.

That is the System Library folder, /Library

not to be confused with your User Library folder

/Users/yourUserName/Library

I have the same problem since the upgrade to os Monterey 12.0.1

if you don't have ANY part of it, then this procedure will do no harm:

How to uninstall Bitdefender Antivirus for Mac

https://www.bitdefender.com/consumer/support/answer/1784/