me too. In default browser of Android 4.2.2.
A temporal fix is add a change in the line 64 of wp-bannerize/Classes/wpBannerizeWidget.php
function widget( $args, $instance ) {
global $wpBannerizeFrontend;
$new_args = array_merge( $args, $instance );
if (isset($wpBannerizeFrontend)) // add this line
echo $wpBannerizeFrontend->bannerize( $new_args );
}