When " All day" is checked the page will not render. I get a TypeError: get_class(): Argument #1 ($object) must be of type object, null given in get_class (line 268 of modules/contrib/calendar_link/src/Twig/CalendarLinkTwigExtension.php).

I'm seeing this also, going to probably downgrade to the previous version of calendar_link that we were using.

In our case we're using the calendar_link with a "paragraph" entity that is referenced by a node.

Hmm, someone else points the finger at D10.3.10 as causing this.

I installed the patch #20 (that Joseph mentioned above in the parent issue link) and the module works now without and error on All day.

Thank you all for all of the help.

No longer need the patch, solution now is to upgrade to ^3.0.4 →