Fatal error: PHP notice in file /var/www/web60/htdocs/wcf/lib/system/cache/CacheBuilderTwitter.class.php (27): Trying to get property of non-object

Information:

error message: PHP notice in file /var/www/web60/htdocs/wcf/lib/system/cache/CacheBuilderTwitter.class.php (27): Trying to get property of non-object
error code: 0
file: /var/www/web60/htdocs/wcf/lib/system/WCF.class.php (255)
php version: 5.4.45
wcf version: 1.0.11 pl 3 (Horizon)
date: Tue, 19 Feb 2019 16:32:02 +0000
request: /index.php?page=Twitter&s=7ae2adbc4251f0e3a42cab616737b0c342a3f41c
referer:

Stacktrace:

#0 /var/www/web60/htdocs/wcf/lib/system/cache/CacheBuilderTwitter.class.php(27): WCF::handleError(8, 'Trying to get p...', '/var/www/web60/...', 27, Array)
#1 /var/www/web60/htdocs/wcf/lib/system/cache/CacheHandler.class.php(253): CacheBuilderTwitter->getData(Array)
#2 /var/www/web60/htdocs/wcf/lib/system/cache/CacheHandler.class.php(188): CacheHandler->rebuild(Array)
#3 /var/www/web60/htdocs/wcf/lib/system/cache/CacheHandler.class.php(155): CacheHandler->load(Array)
#4 /var/www/web60/htdocs/wcf/lib/page/TwitterPage.class.php(32): CacheHandler->get('twitter.wcf')
#5 /var/www/web60/htdocs/wcf/lib/page/AbstractPage.class.php(74): TwitterPage->readData()
#6 /var/www/web60/htdocs/wcf/lib/page/TwitterPage.class.php(55): AbstractPage->show()
#7 /var/www/web60/htdocs/wcf/lib/page/AbstractPage.class.php(36): TwitterPage->show()
#8 /var/www/web60/htdocs/wcf/lib/util/RequestHandler.class.php(63): AbstractPage->__construct()
#9 /var/www/web60/htdocs/wcf/lib/util/RequestHandler.class.php(91): RequestHandler->__construct('Twitter', Array, 'page')
#10 /var/www/web60/htdocs/index.php(16): RequestHandler::handle(Array)
#11 {main}