Resolving Issues Logging Out

When trying to logout,
MySql.Data.MySqlClient.MySqlException
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 'WHERE CONTEXTID = '...'' at line 1

In .../umbraco/businesslogic/BasePages/BasePage.cs (237),
change
	"DELETE umbracoUserLogins WHERE contextId = @contextId"
to
	"DELETE FROM umbracoUserLogins WHERE contextId = @contextId"