Fatal error: Uncaught Error: Call to undefined function is_le_page() in /www/htdocs/w0135a87/natalie-muehlen.de/wp-content/plugins/optimizePressExperiments/src/Experiment.php:78 Stack trace: #0 /www/htdocs/w0135a87/natalie-muehlen.de/wp-includes/class-wp-hook.php(288): OptimizePressStats_Experiment->switchPage(Object(WP_Query)) #1 /www/htdocs/w0135a87/natalie-muehlen.de/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array) #2 /www/htdocs/w0135a87/natalie-muehlen.de/wp-includes/plugin.php(544): WP_Hook->do_action(Array) #3 /www/htdocs/w0135a87/natalie-muehlen.de/wp-includes/class-wp-query.php(1757): do_action_ref_array('pre_get_posts', Array) #4 /www/htdocs/w0135a87/natalie-muehlen.de/wp-includes/class-wp-query.php(3413): WP_Query->get_posts() #5 /www/htdocs/w0135a87/natalie-muehlen.de/wp-includes/class-wp.php(614): WP_Query->query(Array) #6 /www/htdocs/w0135a87/natalie-muehlen.de/wp-includes/class-wp.php(731): WP->query_posts() #7 /www/htdocs/w0135a87/natalie-muehlen.de/wp-includes/functions.php(1255): W in /www/htdocs/w0135a87/natalie-muehlen.de/wp-content/plugins/optimizePressExperiments/src/Experiment.php on line 78