Error when a user selects 'done tagging' without anyone selected in the tag box

If the user selects 'done tagging' when they haven't tagged anyone the following error is displayed:

warning: array_fill() [function.array-fill]: Number of elements must be positive in ... on line 253.
warning: implode() [function.implode]: Invalid arguments passed in ... on line 253.
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 ')' at line 4 query: SELECT u.`uid`, u.`name` FROM users u LEFT JOIN taguser_permission tu ON u.`uid` = tu.`uid` WHERE u.`status` = 1 AND u.`name` IN () in ... on line 903.