Hi, I seem to have the same problem, but I'm not clear how @wilco1219 solved it.
"Call to a member function getData() on null" on attempting to add new or edit an event or category, or opening Configuration.
I'm using JEvents v3.6.42 and Joomla 4.2.3 on a recently created website and newly installed JEvents
Support info:
PHP Version : 8.0.23
MySQL Version : 10.3.28-MariaDB
Server Information : Linux sphere.dse.fastwebservers.com.au 3.10.0-714.10.2.lve1.5.19.9.el7.x86_64 #1 SMP Thu Nov 1 08:01:39 EDT 2018 x86_64
*** CONFIG NOT SAVED***
Fix jQuery? : Yes
Load JEvents Bootstrap CSS? : Yes
Max Input Vars ? : 2000
Club code set? : No
User Agent : Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:105.0) Gecko/20100101 Firefox/105.0
Joomla : 4.2.3
component_com_jevents : 3.6.42
component_com_jce : 2.9.30
module_mod_jevents_cal : 3.6.42
module_mod_jevents_custom : 3.6.42
module_mod_jevents_filter : 3.6.42
module_mod_jevents_latest : 3.6.42
module_mod_jevents_legend : 3.6.42
module_mod_jevents_switchview : 3.6.42
plugin_actionlog_jevents : 3.6.42 (not enabled)
plugin_acymailing_edocman_j30 : 1.0 (not enabled)
plugin_content_jevents : 3.6.42
plugin_finder_jevents : 3.6.42
plugin_installer_jeventsinstaller : 3.6.42
plugin_search_eventsearch : 3.6.42
plugin_system_gwejson : 3.6.42
Many thanks for any help!