Timeline Exception: Call to a member function get_content() on boolean
I tried to add my first H5P timeline to a course in Moodle. I set up two dates, images, captions, etc. H5P saved it w/o any error message and I can see the activity in my course. When I (or sb else) try to open it I get 'Exception - Call to a member function get_content() on boolean' error message. I deleted and re-created the activity with no luck.
Additionally on the page with the Exception I also have a js console error msg: ReferenceError: H5PIntegration is not defined @ h5p.js:987:7.
We have the latest Moodle (3.7.2+?) on Debian 3.16.39, Apache 2.4.25, php 7.1.30, PostgreSQL 9.6.13, with fresh H5P modules. All the other H5P modules (a lot) we use work perfectly.