Fatal error: Uncaught Error: Call to undefined function is_product() in /nfs/c03/h07/mnt/50118/domains/tr.turkeygrandprix.com/html/wp-content/plugins/mage-eventpress/inc/mep_functions.php:2803 Stack trace: #0 /nfs/c03/h07/mnt/50118/domains/tr.turkeygrandprix.com/html/wp-includes/class-wp-hook.php(307): mep_hide_hidden_product_from_single(Object(WP)) #1 /nfs/c03/h07/mnt/50118/domains/tr.turkeygrandprix.com/html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array) #2 /nfs/c03/h07/mnt/50118/domains/tr.turkeygrandprix.com/html/wp-includes/plugin.php(524): WP_Hook->do_action(Array) #3 /nfs/c03/h07/mnt/50118/domains/tr.turkeygrandprix.com/html/wp-includes/class-wp.php(787): do_action_ref_array('wp', Array) #4 /nfs/c03/h07/mnt/50118/domains/tr.turkeygrandprix.com/html/wp-includes/functions.php(1330): WP->main('') #5 /nfs/c03/h07/mnt/50118/domains/tr.turkeygrandprix.com/html/wp-blog-header.php(16): wp() #6 /nfs/c03/h07/mnt/50118/domains/tr.turkeygrandprix.com/html/index.php(17): require('/nfs/c03/h07/mn...') #7 in /nfs/c03/h07/mnt/50118/domains/tr.turkeygrandprix.com/html/wp-content/plugins/mage-eventpress/inc/mep_functions.php on line 2803