Error when viewing events after 4.4.0

After debugging the user's website, the fix was:

UPDATE #__jem_venues SET access = 1 WHERE access = 0;

(Replace #__ with your actual Joomla database prefix)

See more info:  github.com/jemproject/JEM-Project/issues/2093  

Thanks @McKillo, that was the problem.
Never thought it was a problem with the venues.
Fixed!!!

This fix will be included in JEM 4.4.1

I found that the locations with access=0 are those that were entered a long time ago 
As in the JEM 2.3.6 timeframe

Hi,

In the case of update directly JEM 4.3.4/J 5.4.2 to JEM 4.4.1/J 5.4.2 the problem remains, also after update J 5.4.2 to J 5.4.3 : events aren't displayed... 
Error
Event not found!
An error has occurred.

An idea to solve in this case?

Henri