Error in startup tests running on Ubuntu

[osul67mnj]

Hello,

When running ./cae.sh on Ubuntu 24.04 the startup tests do not complete; I get the following:

STARTUP TESTS

INFO: Python version is 3.10.9.
INFO: CAE version is 0.9.1.
INFO: Default web browser is google-chrome.
INFO: PyQt5 OK
INFO: PyQtWebEngine OK
INFO: Xlib OK
INFO: python-xlib OK
INFO: python3-xlib OK
INFO: ccx2paraview OK
INFO: unv2ccx OK
INFO: numpy OK
INFO: vtk OK
Traceback (most recent call last):
File "/home/mnjos67/ccx_cae/src/cae.py", line 73, in
wf.run_master(p.main_xml)
File "/home/mnjos67/ccx_cae/src/gui/window.py", line 105, in run_master
self.mw = MasterWindow(xml)
File "/home/mnjos67/ccx_cae/src/gui/window.py", line 55, in fcn
before = get_opened_windows()
File "/home/mnjos67/ccx_cae/src/gui/window.py", line 307, in get_opened_windows
return wc.get_opened_windows()
File "/home/mnjos67/ccx_cae/src/gui/connection.py", line 256, in get_opened_windows
Xlib.X.AnyPropertyType).value
AttributeError: 'NoneType' object has no attribute 'value'

When I run on Windows everything is OK.