not work with frontend tinymce

provisory fix: wp-emoji-one.php

#------------------------------------------------------------------------------
# Insert WP Emoji One Icon for tinyMCE
#------------------------------------------------------------------------------
function wp_emoji_one_addbuttons() {
	// Don't bother doing this stuff if the current user lacks permissions
	#if ( !current_user_can('edit_posts') && !current_user_can('edit_pages') ) return;
	// Add only in Rich Editor mode
	#if ( get_user_option('rich_editing') == 'true') {
	// add the button for wp25 in a new way
		add_filter("mce_external_plugins", 'add_wp_emoji_one_tinymce_plugin');
		$wp_emoji_one_setting_opt = get_option('wp_emoji_one_setting_opt');
		$button_line = $wp_emoji_one_setting_opt['wp_emoji_one_button_line'];
		if ($button_line == "2" || $button_line == "3" || $button_line == "4") {
			add_filter('mce_buttons_'.$button_line, 'register_wp_emoji_one_button');
		} else {
			add_filter('mce_buttons', 'register_wp_emoji_one_button');
		}
	#}
}

(just some comment with #)

https://wordpress.org/plugins/wp-emoji-one/