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Fatal error: Uncaught TypeError: get_class(): Argument #1 ($object) must be of type object, null given in /www/htdocs/w0193bc5/erichuether.de/wp-content/plugins/tw-membership/include/models/celement.php:27 Stack trace: #0 /www/htdocs/w0193bc5/erichuether.de/wp-content/plugins/tw-membership/include/models/celement.php(27): get_class(NULL) #1 /www/htdocs/w0193bc5/erichuether.de/wp-content/plugins/tw-membership/include/models/course.php(517): MemberWunder\Models\CElement->is_preview() #2 /www/htdocs/w0193bc5/erichuether.de/wp-content/plugins/tw-membership/include/controller/pages.php(687): MemberWunder\Models\Course->get_link() #3 /www/htdocs/w0193bc5/erichuether.de/wp-includes/class-wp-hook.php(324): MemberWunder\Controller\Pages::load_logic(Object(WP)) #4 /www/htdocs/w0193bc5/erichuether.de/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(Object(MemberWunder\Hooks\Elementor), Array) #5 /www/htdocs/w0193bc5/erichuether.de/wp-includes/plugin.php(565): WP_Hook->do_action(Array) #6 /www/htdocs/w0193bc5/erichuether.de/wp-includes/class-wp.php(830): do_action_ref_array('wp', Array) #7 /www/htdocs/w0193bc5/erichuether.de/wp-includes/functions.php(1336): WP->main('') #8 /www/htdocs/w0193bc5/erichuether.de/wp-blog-header.php(16): wp() #9 /www/htdocs/w0193bc5/erichuether.de/index.php(17): require('/www/htdocs/w01...') #10 {main} thrown in /www/htdocs/w0193bc5/erichuether.de/wp-content/plugins/tw-membership/include/models/celement.php on line 27