Script SQL query fails to execute

In the following string, an SQL query for data to the database returns an else condition.

 $sql = $db->select('table', array('special_url' => $_GET['table_name'], 'status' => 1));

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This should return data to the index page, however it results in a 404 redirect by script
 

if ($sql->exists) {
	$name = $sql->fetch();
} else redirect("404.php");

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So were getting a 404 even though we have data in the database where the status is equal to 1

some of the variable names have been changed, because of the nature of the data involved.

Any thoughts on what were missing here or a way to discover what is causing the else redirect condition