An Extra Last Empty Field In An 'mysql_fetch_array' Result Array?

I seem to get an extra empty field in every 'mysql_fetch_array' command I issue. For example:

I have a simple table 'tblName':

ID Name
1 Jane
2 Joe
2 Doe

The following code:

$oCursor = mysql_query("SELECT ID from tblName WHERE Name='Jane'");
if (!$oCursor)
{
$bGo = false;
}
else
{
$aRow = mysql_fetch_array($oCursor);
}

results in:

count($aRow) = 2;

$aRow[0] = 1;
$aRow[1] = ''

Am I missing something, doing something wrong, a wrong PHP setting?