SQL Error

I get the following error when trying to set configurations for Drupal chat:

* warning: implode() [function.implode]: Invalid arguments passed in /home/national/public_html/sites/all/modules/drupalchat/drupalchat.module on line 301.
* user warning: 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 ') ORDER BY status, name' at line 1 query: SELECT uid, name, status FROM drupalchat_users WHERE timestamp >= 1284840285 AND () ORDER BY status, name in /home/national/public_html/sites/all/modules/drupalchat/drupalchat.module on line 301.
* warning: implode() [function.implode]: Invalid arguments passed in /home/national/public_html/sites/all/modules/drupalchat/drupalchat.module on line 301.
* user warning: 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 ') ORDER BY status, name' at line 1 query: SELECT uid, name, status FROM drupalchat_users WHERE timestamp >= 1284840286 AND () ORDER BY status, name in /home/national/public_html/sites/all/modules/drupalchat/drupalchat.module on line 301.
* warning: implode() [function.implode]: Invalid arguments passed in /home/national/public_html/sites/all/modules/drupalchat/drupalchat.module on line 301.
* user warning: 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 ') ORDER BY status, name' at line 1 query: SELECT uid, name, status FROM drupalchat_users WHERE timestamp >= 1284840289 AND () ORDER BY status, name in /home/national/public_html/sites/all/modules/drupalchat/drupalchat.module on line 301.