Flyerimage not working

Maybe my description wasn't clear enough. The image is there but the popup (when clicking on the image) is not working.

Warning: Undefined property: stdClass::$flyer in /components/com_jem/classes/output.class.php on line 1193

Warning: Undefined property: stdClass::$flyer in /components/com_jem/classes/output.class.php on line 1213

Warning: Undefined property: stdClass::$flyer in /components/com_jem/classes/output.class.php on line 1227

Warning: Undefined property: stdClass::$flyer in /components/com_jem/classes/output.class.php on line 1233

In my eyes it was never thought, that the map must be a flyer for popup. Only the event and venue images!

Not the map, but the venue image. I don't know if it was never meant to be.  Just migrated a site from Joomla 3 with JEM 236 (where the venue image was nicely shown in a poppup) to Joomla 5.2.1 with JEM 4.3.1 and now it doesn't work anymore.

One of our devs is on it: it's an jquery problem