500 error

Hi, I have been using your excellent plugin for a long time and it speeds up my work a lot.
However, the latest version is causing some problems. When syncing to a remote server from a local installation, I get an error message at the end of the process. I looked through the error.log and found nothing, but in the access.log I found the above mentioned error.

Is this a fault of my server settings or rather a plugin error? Please help.

access.log: https://i.imgur.com/kgjRsYG.png
error: https://i.imgur.com/jHpSWiG.png