ID is properly set before using it $aerial_drone_post_sidebar = $post ? esc_html(get_post_meta($post->ID, 'aerial_drone_post_sidebar_option', true)) : ''; $aerial_drone_sidebar_column_class = 'column-order-2'; if (empty($aerial_drone_post_sidebar)) { $aerial_drone_global_sidebar_layout = esc_html( get_theme_mod( 'aerial_drone_global_sidebar_layout',$aerial_drone_default['aerial_drone_global_sidebar_layout'] ) ); } else { $aerial_drone_global_sidebar_layout = $aerial_drone_post_sidebar; } if ( ! is_active_sidebar( 'sidebar-1' ) || $aerial_drone_global_sidebar_layout == 'no-sidebar' ) { return; } if ($aerial_drone_global_sidebar_layout == 'left-sidebar') { $aerial_drone_sidebar_column_class = 'column-order-1'; } ?>