php - Can't acces "home page" OJS 3211 + OldGregg

My ojs home page (ojs 3211+OldGregg, php 7.4) can not accessible, but other pages are accessible. error log file shows:
[01-Aug-2021 00:56:47 Asia/Jakarta] PHP Fatal error: Uncaught Error: Call to a member function getLocalizedFullTitle() on null in /home/jurnalpr/lab.jurnalim.id/plugins/themes/oldGregg/OldGreggThemePlugin.inc.php:227 Stack trace: #0 /home/jurnalpr/lab.jurnalim.id/lib/pkp/classes/cache/GenericCache.inc.php(63): OldGreggThemePlugin->_toCache(Object(FileCache), NULL) #1 /home/jurnalpr/lab.jurnalim.id/lib/pkp/classes/cache/FileCache.inc.php(115): GenericCache->get(NULL) #2 /home/jurnalpr/lab.jurnalim.id/plugins/themes/oldGregg/OldGreggThemePlugin.inc.php(181): FileCache->getContents() #3 /home/jurnalpr/lab.jurnalim.id/lib/pkp/classes/plugins/HookRegistry.inc.php(107): OldGreggThemePlugin->browsePopular('TemplateManager...', Array) #4 /home/jurnalpr/lab.jurnalim.id/lib/pkp/classes/template/PKPTemplateManager.inc.php(906): HookRegistry::call('TemplateManager...', Array) #5 /home/jurnalpr/lab.jurnalim.id/pages/index/IndexHandler.inc.php(66): PKPTemplateManager->display('frontend/pages/...') #6 /home/jurnalpr/lab.jurnalim.id/lib/pkp/classes/core/PKPRouter.inc.php(391): in /home/jurnalpr/lab.jurnalim.id/plugins/themes/oldGregg/OldGreggThemePlugin.inc.php on line 227
Do anyone has the same chase? Can I get help?
my best regards
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