Fatal error with latest update

After update to your latest version we get this error in some sites of a multisite installation:

Fatal error: Uncaught Error: Call to undefined function esc_att()
in /home/xxx/public_html/wp-content/plugins/quick-adsense-reloaded/includes/widgets.php on line 385

Pila de llamadas:

quads_widgets_6::widget()
wp-includes/class-wp-widget.php:394
WP_Widget::display_callback()
wp-includes/widgets.php:835
dynamic_sidebar()
wp-content/themes/xxx/sidebar.php:4
require_once()
wp-includes/template.php:783
load_template()
wp-includes/template.php:718
locate_template()
wp-includes/general-template.php:136
get_sidebar()
wp-content/themes/xxx/index.php:21
include()
wp-includes/template-loader.php:106
require_once()
wp-blog-header.php:19
require()
index.php:17

Please fix it!

Best regards.