PHP while loop issue with associative array

I have two while loops populating associative arrays -- I can run one at a time (ie commenting the other out) however, when I run both at the same time I receive a server error. Despite the queries not querying the same set of data I've still tried adding a pointer reset with no luck. Here are the two loops:

$thecurrent = array();
$getusers = "SELECT score, uid, like_id FROM wetique_scores GROUP BY like_id;";
$gotusers = mysql_query($getusers,$con);


while ($row = mysql_fetch_array($gotusers))
{
    $score = $row['score'];
    $userid = $row['uid'];
    $likeid = $row['like_id'];
    $comboid = $userid.$likeid;
    $thecurrent[$comboid] = $score;
}

// 2. calculate new score from db and create array $new

$new = array();
$getusers2 = "SELECT like_id, sum(friend_rating), uid from likes l, friendships f WHERE l.friend_id = f.friend_id GROUP BY l.like_id;";
$gotusers2 = mysql_query($getusers2,$con);
while ($rowb = mysql_fetch_array($gotusers2))
{
    $scoreb = $rowb['sum(friend_rating)'];
    $useridb = $rowb['uid'];
    $likeidb = $rowb['like_id'];
    $comboidb = $useridb.$likeidb;
    $new[$comboidb] = $scoreb;   
}