Can't install OldGregg theme on OJS 3.3.0.18 white screen

Can’t install OldGregg theme on OJS 3.3.0.18 white screen
I have the following error in the log:
AH01071: Got error ‘PHP message: PHP Fatal error: Uncaught Error: Call to a member function getLocalizedData() on null in /data/publications/journals/cache/t_compile/65bfc3e024c2e9104f46e23b73376a9455e3df0e^da5cddfde2ebc97f3525f2500ecb83429bd5fe44_0.app.frontendcomponentsheaderHead.tpl.php:42\nStack trace:\n#0 /data/publications/journals/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_6722ab44651226_74097642()\n#1 /data/publications/journals/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode()\n#2 /data/publications/journals/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render()\n#3 /data/publications/journals/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(386): Smarty_Internal_Template->render()\n#4 /data/publications/journals/cache/t_compile/65bfc3e024c2e9104f46e23b73376a9455e3df0e^10ae5578a0…’, referer:/journals/index.php/index/admin/settings