i was seeing the same issue mentioned HERE - even though the errors are cluttering the logs, the module seems to work. i tried the version from HEAD as suggested in the in the previous issue but it breaks all functionality (no longer able to block content) and logs these errors:

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 'ON u.uid = . WHERE . = 0' at line 1 query: SELECT u.uid FROM users u INNER JOIN ON u.uid = . WHERE . = 0 in /../../public_html/includes/database.mysql.inc on line 172.

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MrGeek’s picture

MrGeek commented
Status: Active » Closed (fixed)

Well just in case anyone else has this issue, upgrading to PHP5 seems to cure it..