wp_editor() in WordPress Text Widget without plugin

Hello.
I’m used next code for create child class of WP_Widget_Text:

function Custom_Widget_Text() {
  unregister_widget("WP_Widget_Text");
  register_widget("Custom_WP_Widget_Text");
}
add_action("widgets_init", "Custom_Widget_Text");

class Custom_WP_Widget_Text extends WP_Widget_Text {

  function __construct() {
    $widget_ops = array('classname' => 'widget_text', 'description' => __('Arbitrary text or HTML'));
    $control_ops = array('width' => 600, 'height' => 350);
    WP_Widget::__construct('text', __('Text'), $widget_ops, $control_ops);
  }

  function form( $instance ) {
    $instance = wp_parse_args( (array) $instance, array( 'title' => '', 'text' => '' ) );
    $title = strip_tags($instance['title']);
    $text = esc_textarea($instance['text']);
?>
    <p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?></label>
    <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo esc_attr($title); ?>" /></p>
<?php
  $options = array(
    'media_buttons' => true,
    'textarea_name' => $this->get_field_name('text'),
    'textarea_rows' => '16',
    'tinymce' => true,
    'quicktags' => false
  );
  wp_editor($text, $this->get_field_id('text'), $options);
?>
    <p><input id="<?php echo $this->get_field_id('filter'); ?>" name="<?php echo $this->get_field_name('filter'); ?>" type="checkbox" <?php checked(isset($instance['filter']) ? $instance['filter'] : 0); ?> /> <label for="<?php echo $this->get_field_id('filter'); ?>"><?php _e('Automatically add paragraphs'); ?></label></p>
<?php
  }

}

But i’m having 1 problem after saving text in standard mode:
<img src=”” alt=”http://s58.radikal.ru/i162/1303/d3/087fb9daf9ed.png&#8221; />

What me doing with WordPress Ajax?