[5.0.2] Blog RSS issue

After click RSS in to blog:

TypeError: IPS\Xml\Rss::newDocument(): Argument #2 ($title) must be of type string, null given, called in /home/database/public_html/applications/blog/Application.php on line 95 (0)

#0 /home/database/public_html/applications/blog/Application.php(95): IPS\Xml\Rss::newDocument(Object(IPS\Http\Url\Friendly), NULL, '<p>\xD0\xA2\xD1\x83\xD0\xBA \xD1\x89\xD0\xB5 ...')

#1 /home/database/public_html/applications/blog/Application.php(55): IPS\blog\Application->sendBlogRss(Object(IPS\Member))

#2 /home/database/public_html/system/Dispatcher/Standard.php(230): IPS\blog\Application->init()

#3 /home/database/public_html/system/Dispatcher/Front.php(206): IPS\Dispatcher\Standard->init()

#4 /home/database/public_html/system/Dispatcher/Dispatcher.php(126): IPS\Dispatcher\Front->init()

#5 /home/database/public_html/index.php(16): IPS\Dispatcher::i()

#6 {main}