Maybe related to #11415:

After doing this upgrade on a 2.1.6 installation:

FrontEndUsers from version 2.3.2 to version 2.4.1
CGExtensions from version 1.54.1 to version 1.55.5

I suddenly get these errors when logged in as FEU and clicking a FEU Logout
Link:

Code:
ERROR: at line 2015 in file
/home/user/domains/domain.com/public_html/modules/CGExtensions/CGExtensions.module.php:

Invalid resource name passed to CGExtensions::CGGetTemplateResource

#0
/home/user/domains/domain.com/public_html/modules/CGExtensions/CGExtensions.module.php(1981):
CGExtensions->CGGetTemplateResource('string:home', NULL)
#1
/home/user/domains/domain.com/public_html/modules/FrontEndUsers/action.logout.php(61):
CGExtensions->CreateSmartyTemplate('string:home')
#2
/home/user/domains/domain.com/public_html/lib/classes/class.CMSModule.php(1415):
include('/home/user/dom...')
#3
/home/user/domains/domain.com/public_html/modules/CGExtensions/CGExtensions.module.php(621):
CMSModule->DoAction('logout', 'cntnt01', Array, '1')
#4
/home/user/domains/domain.com/public_html/modules/FrontEndUsers/FrontEndUsers.module.php(626):
CGExtensions->DoAction('logout', 'cntnt01', Array, '1')
#5
/home/user/domains/domain.com/public_html/lib/classes/class.CMSModule.php(1489):
FrontEndUsers->DoAction('logout', 'cntnt01', Array, '1')
#6 /home/user/domains/domain.com/public_html/lib/page.functions.php(543):
CMSModule->DoActionBase('logout', 'cntnt01', Array, '1', Object(Smarty_CMS))
#7 /home/user/domains/domain.com/public_html/index.php(134):
preprocess_mact('1')
#8 {main}


Upgrading CMS Made Simple to 2.2.1 didn't fix this unfortunately.