Unable to use the Pages app. Every time I access it, the following error appears. Note: this is a new installation, and the only third-party app I installed was Discord for Invision Community 5, but the error was already occurring well before I installed it.
TypeError: IPS\cms\Pages\Page::getSortableName(): Return value must be of type string, null returned (0)
#0 /home/astronis/public_html/applications/cms/sources/Pages/Folder.php(61): IPS\cms\Pages\Page->getSortableName()
#1 /home/astronisastronisastronisastronis/public_html/applications/cms/modules/admin/pages/pages.php(391): IPS\cms\Pages\Folder::munge(Array, Array)
#2 /home/astronisastronisastronis/public_html/applications/cms/modules/admin/pages/pages.php(107): IPS\cms\modules\admin\pages\pages::getRowsForTree(0)
#3 /home/astronisastronis/public_html/system/Helpers/Tree/Tree.php(144): IPS\cms\modules\admin\pages\pages->IPS\cms\modules\admin\pages\{closure}(NULL)
#4 /home/astronis/public_html/applications/cms/modules/admin/pages/pages.php(103): IPS\Helpers\Tree\Tree->__toString()
#5 /home/astronis/public_html/system/Dispatcher/Controller.php(139): IPS\cms\modules\admin\pages\pages->manage()
#6 /home/astronis/public_html/system/Node/Controller.php(117): IPS\Dispatcher\Controller->execute()
#7 /home/astronis/public_html/applications/cms/modules/admin/pages/pages.php(79): IPS\Node\Controller->execute()
#8 /home/astronis/public_html/system/Dispatcher/Dispatcher.php(169): IPS\cms\modules\admin\pages\pages->execute()
#9 /home/astronis/public_html/admin/index.php(15): IPS\Dispatcher->run()
#10 {main}
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