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I cannot publish new posts on my page with Atticus theme enabled. Previewing or showing published posts results in this error message displayed instead of the post content:
Fatal error: Call to undefined function is_plugin_active() in /home/platne/serwer14124/public_html/blog/wp-content/themes/atticus/tmp-1right-sidebar.php on line 189
Disabling Atticus and enabling any other theme makes the error go away. I have Atticus 1.6 and WordPress 4.6.1. Yes, in a normal situation I would start with Atticus theme update but download link available on ThemeForest leads to insecure location (both Chrome and Edge are displaying security notice about incorrect security certificate) so I basically cannot download new Atticus version.