Daily-stat-1.5.4 breaks SiteTree-1.5.3 plugin?

Hi,
when trying to access http://foo.com/sitemap.xml (http://www.foo.com/sitemap.xml works!) generated via SiteTree plugin I get:

Error loading stylesheet: An unknown error has occurred (805303f4)
http://www.foo.com/wp-content/plugins/sitetree/resources/template.xsl

and in error_log I have:

[Mon Feb 17 15:28:57 2014] [error] [client xx.xx.xx.xx] PHP Notice:  Constant WP_DEBUG already defined in /var/www/localhost/htdocs/foo/wp-config.php on line 86
[Mon Feb 17 15:28:57 2014] [error] [client xx.xx.xx.xx] PHP Notice:  Undefined variable: perm in /var/www/localhost/htdocs/foo/wp-content/plugins/daily-stat/statpress.php on line 783
[Mon Feb 17 15:28:57 2014] [error] [client xx.xx.xx.xx] PHP Notice:  Undefined offset: 1 in /var/www/localhost/htdocs/foo/wp-content/plugins/daily-stat/statpress.php on line 221
[Mon Feb 17 15:28:57 2014] [error] [client xx.xx.xx.xx] PHP Notice:  Undefined offset: 1 in /var/www/localhost/htdocs/foo/wp-content/plugins/daily-stat/statpress.php on line 228
[Mon Feb 17 15:28:57 2014] [error] [client xx.xx.xx.xx] PHP Notice:  Trying to get property of non-object in /var/www/localhost/htdocs/foo/wp-content/plugins/daily-stat/statpress.php on line 264

Thank you for your help.

https://wordpress.org/plugins/daily-stat/