Fatal error: PHP error in file /www/htdocs/v141994/wbb3/lib/page/RGalleryPage.class.php (213): Non-static method RGallerySystem::getCurrentCategorie() should not be called statically, assuming $this from incompatible context

Information:

error message: PHP error in file /www/htdocs/v141994/wbb3/lib/page/RGalleryPage.class.php (213): Non-static method RGallerySystem::getCurrentCategorie() should not be called statically, assuming $this from incompatible context
error code: 0
file: /www/htdocs/v141994/wbb3/wcf/lib/system/WCF.class.php (255)
php version: 5.5.38-nmm2
wcf version: 1.0.11 pl 3 (Horizon)
date: Tue, 21 Nov 2017 00:56:27 +0000
request: /wbb3/index.php?page=RGallery&rGalleryCat=none&reset_tag=1
referer:

Stacktrace:

#0 /www/htdocs/v141994/wbb3/lib/page/RGalleryPage.class.php(213): WCF::handleError(2048, 'Non-static meth...', '/www/htdocs/v14...', 213, Array)
#1 /www/htdocs/v141994/wbb3/wcf/lib/page/AbstractPage.class.php(36): RGalleryPage->show()
#2 /www/htdocs/v141994/wbb3/wcf/lib/util/RequestHandler.class.php(63): AbstractPage->__construct()
#3 /www/htdocs/v141994/wbb3/wcf/lib/util/RequestHandler.class.php(91): RequestHandler->__construct('RGallery', Array, 'page')
#4 /www/htdocs/v141994/wbb3/index.php(8): RequestHandler::handle(Array)
#5 {main}