[Plugin: Subscribe To Comments Reloaded] Plugin registering error after activation

Hi,
For some time now I have been noticing an error that appears in error log file if I use All In One Seo pack and Subscribe to comments reloaded plugin together. Following is the error:

WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') <= DATE_SUB(NOW(), INTERVAL 2 DAY) AND meta_value LIKE '%C'' at line 3 for query
			DELETE FROM wp_postmeta
			WHERE meta_key LIKE '\_stcr@\_%'
				AND STR_TO_DATE(meta_value) <= DATE_SUB(NOW(), INTERVAL 2 DAY) AND meta_value LIKE '%C' made by do_action_ref_array, call_user_func_array, wp_subscribe_reloaded->subscribe_reloaded_purge

This error did not appear when I removed this plugin.

Please take a look at this.

https://www.ads-software.com/extend/plugins/subscribe-to-comments-reloaded/