[Plugin: WP Super Cache] Error notice when WP_DEBUG turn on

When turned on WP_DEBUG I got this warning

Undefined variable: cache_wptouch in /home/.../html/wp-content/plugins/wp-super-cache/plugins/wptouch.php on line 109 which creates header already send error.

Disabled the plugin. Hope to see it fixed on next version.

http://wordpress.org/extend/plugins/wp-super-cache/