Fatal error: PHP error in file /www/htdocs/w0087e20/forum/wcf/lib/page/CustomPage.class.php (47): Non-static method CustomPageEditor::getChildPages() should not be called statically, assuming $this from incompatible context

Information:

error message: PHP error in file /www/htdocs/w0087e20/forum/wcf/lib/page/CustomPage.class.php (47): Non-static method CustomPageEditor::getChildPages() should not be called statically, assuming $this from incompatible context
error code: 0
file: /www/htdocs/w0087e20/forum/wcf/lib/system/WCF.class.php (281)
php version: 5.6.40-nmm8
wcf version: 1.1.10 pl 2 (Tempest)
date: Thu, 18 Apr 2024 15:47:51 +0000
request: /forum/index.php?page=Custom&pageID=1&s=ec6da4233133a159e36a712621e3d45426164e13
referer:

Stacktrace:

#0 /www/htdocs/w0087e20/forum/wcf/lib/page/CustomPage.class.php(47): WCF::handleError(8192, 'Non-static meth...', '/www/htdocs/w00...', 47, Array)
#1 /www/htdocs/w0087e20/forum/wcf/lib/page/AbstractPage.class.php(90): CustomPage->readData()
#2 /www/htdocs/w0087e20/forum/wcf/lib/page/CustomPage.class.php(76): AbstractPage->show()
#3 /www/htdocs/w0087e20/forum/wcf/lib/page/AbstractPage.class.php(46): CustomPage->show()
#4 /www/htdocs/w0087e20/forum/wcf/lib/util/RequestHandler.class.php(64): AbstractPage->__construct()
#5 /www/htdocs/w0087e20/forum/wcf/lib/util/RequestHandler.class.php(92): RequestHandler->__construct('Custom', Array, 'page')
#6 /www/htdocs/w0087e20/forum/index.php(8): RequestHandler::handle(Array)
#7 {main}