Fatal error: Uncaught Error: Call to a member function getDisplayName() on null in /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/classes/galley/Galley.php:160 Stack trace: #0 /home/u176139101/domains/journal.umuslim.ac.id/public_html/cache/t_compile/42362804174f266c598cdb32c3208fc745b92101^9190456890661656c2db668fc3c363ee4354c517_0.app.frontendobjectsgalley_link.tpl.php(77): PKP\galley\Galley->getGalleyLabel() #1 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_6a5b30398648c3_49017741() #2 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode() #3 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render() #4 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(386): Smarty_Internal_Template->render() #5 /home/u176139101/domains/journal.umuslim.ac.id/public_html/cache/t_compile/42362804174f266c598cdb32c3208fc745b92101^addd65021fadf964339ab08cd1aa93ba59b14e9c_0.app.frontendobjectsarticle_details.tpl.php(334): Smarty_Internal_Template->_subTemplateRender() #6 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_6a5b3039844a44_11109022() #7 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode() #8 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render() #9 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(386): Smarty_Internal_Template->render() #10 /home/u176139101/domains/journal.umuslim.ac.id/public_html/cache/t_compile/42362804174f266c598cdb32c3208fc745b92101^1c372c95cd85572e0fbc9a53d0323a0b229cfc78_0.app.frontendpagesarticle.tpl.php(40): Smarty_Internal_Template->_subTemplateRender() #11 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_6a5b30397ad834_10782542() #12 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode() #13 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render() #14 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php(238): Smarty_Internal_Template->render() #15 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php(134): Smarty_Internal_TemplateBase->_execute() #16 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/classes/template/PKPTemplateManager.php(1373): Smarty_Internal_TemplateBase->display() #17 /home/u176139101/domains/journal.umuslim.ac.id/public_html/pages/article/ArticleHandler.php(355): PKP\template\PKPTemplateManager->display() #18 [internal function]: APP\pages\article\ArticleHandler->view() #19 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/classes/core/PKPRouter.php(334): call_user_func() #20 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/classes/core/PKPPageRouter.php(278): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest() #21 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPPageRouter->route() #22 /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/classes/core/PKPApplication.php(395): PKP\core\Dispatcher->dispatch() #23 /home/u176139101/domains/journal.umuslim.ac.id/public_html/index.php(21): PKP\core\PKPApplication->execute() #24 {main} thrown in /home/u176139101/domains/journal.umuslim.ac.id/public_html/lib/pkp/classes/galley/Galley.php on line 160