Canadian monuments give errors when trying to approach statistics:
https://tools.wmflabs.org/heritage/api/api.php?action=statistics&stcountry=ca&format=html&limit=0
linked from https://commons.wikimedia.org/wiki/Commons:Monuments_database/Statistics
(for comparison, ch works fine)
Errors:
Notice: Undefined offset: 3 in /data/project/heritage/heritage/api/includes/Statistics.php on line 109
Notice: Undefined offset: 2 in /data/project/heritage/heritage/api/includes/Statistics.php on line 109
etc (many times)
Warning: Cannot modify header information - headers already sent by (output started at /data/project/heritage/heritage/api/includes/Statistics.php:109) in /data/project/heritage/heritage/api/includes/FormatBase.php on line 22
then below that, some table is printed.