Adding On-site study task to Panl workflow results in crash

[TjerkNan]

Describe the bug
When adding an On-site study task to a Panl project workflow, the site becomes unresponsive.
When navigating away from the study, it's no longer possible to open the Panl project item (study), this is why this is considered high. The study is lost and needs to be deleted.

To Reproduce
Steps to reproduce the behavior:
1.Create new Panl study

1. Go to workflow
2. Add On-site study task

Observe unrepsonsiveness

Screenshots
logs.txt