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Cannot set properties of null (setting 'overlapping')

Asked by Leo
23 hours ago.

Hi Dan,

Since 2025.4.6661, our Sentry is filling up with errors in the Scheduler and Gantt component:

Cannot set properties of null (setting 'overlapping')

It appears to happen when refreshing the event list, however I can’t reproduce it myself, so I am not 100% sure what causes it.

Would you have any idea?

bug javascript
Comment posted by Dan Letecky [DayPilot]
20 hours ago.

We are seeing this error in the logs as well but we are still investigating the issue. I’ll keep you updated.

Answer posted by Dan Letecky [DayPilot]
18 hours ago.

Hi Leo,

This issue should be fixed now in the latest sandbox build (2025.4.6672).

It was relatively harmless - it had no effect on the UI in most cases.

You could reproduce it using Ctrl + click on an event.

Please let me know if there is any problem.

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Event calendar/scheduling AJAX components. Available for JavaScript/HTML5/jQuery, ASP.NET, ASP.NET MVC. Build resource booking, project management, time tracking applications, personal and shared event calendars.