[RSS Feed/News] ErrorException: Template error: [E_USER_WARNING] Cannot call method isOnline on a non-object (NULL) src/XF/Template/Templater.php:1169 Generated by: U

[XenForo]

Please could someone help me .. I am trying to find out what this error showing in my admin page in the error section.
here is an output of the details

#0 [internal function]: XF\Template\Templater->handleTemplateError(512, '[E_USER_WARNING...', '/home/forumadmi...', 1169, Array)
#1 src/XF/Template/Templater.php(1169): trigger_error('Cannot call met...', 512)
#2 internal_data/code_cache/templates/l1/s2/public/message_macros.php(186): XF\Template\Templater->method(NULL, 'isOnline'...
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