Database creating duplicate entries in MySQL and PHP.

<?php
    include("settings.php");
    if (empty($_SESSION['steam_uptodate']) or $_SESSION['steam_uptodate'] == false or empty($_SESSION['steam_personaname'])) {
        $url = file_get_contents("http://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/?key=".$steamauth['apikey']."&steamids=".$_SESSION['steamid']); 
        $content = json_decode($url, true);
        $_SESSION['steam_steamid'] = $content['response']['players'][0]['steamid'];
        $_SESSION['steam_communityvisibilitystate'] = $content['response']['players'][0]['communityvisibilitystate'];
        $_SESSION['steam_profilestate'] = $content['response']['players'][0]['profilestate'];
        $_SESSION['steam_personaname'] = $content['response']['players'][0]['personaname'];
        $_SESSION['steam_lastlogoff'] = $content['response']['players'][0]['lastlogoff'];
        $_SESSION['steam_profileurl'] = $content['response']['players'][0]['profileurl'];
        $_SESSION['steam_avatar'] = $content['response']['players'][0]['avatar'];
        $_SESSION['steam_avatarmedium'] = $content['response']['players'][0]['avatarmedium'];
        $_SESSION['steam_avatarfull'] = $content['response']['players'][0]['avatarfull'];
        $_SESSION['steam_personastate'] = $content['response']['players'][0]['personastate'];
        $_SESSION['steam_realname'] = $content['response']['players'][0]['realname'];
        $_SESSION['steam_primaryclanid'] = $content['response']['players'][0]['primaryclanid'];
        $_SESSION['steam_timecreated'] = $content['response']['players'][0]['timecreated'];
        $_SESSION['steam_uptodate'] = true;
    }

    $steamprofile['steamid'] = $_SESSION['steam_steamid'];
    $steamprofile['communityvisibilitystate'] = $_SESSION['steam_communityvisibilitystate'];
    $steamprofile['profilestate'] = $_SESSION['steam_profilestate'];
    $steamprofile['personaname'] = $_SESSION['steam_personaname'];
    $steamprofile['lastlogoff'] = $_SESSION['steam_lastlogoff'];
    $steamprofile['profileurl'] = $_SESSION['steam_profileurl'];
    $steamprofile['avatar'] = $_SESSION['steam_avatar'];
    $steamprofile['avatarmedium'] = $_SESSION['steam_avatarmedium'];
    $steamprofile['avatarfull'] = $_SESSION['steam_avatarfull'];
    $steamprofile['personastate'] = $_SESSION['steam_personastate'];
    $steamprofile['realname'] = $_SESSION['steam_realname'];
    $steamprofile['primaryclanid'] = $_SESSION['steam_primaryclanid'];
    $steamprofile['timecreated'] = $_SESSION['steam_timecreated'];


DEFINE('DB_USER', 'root');
DEFINE('DB_PASSWORD', '');
DEFINE('DB_HOST','localhost');
DEFINE('DB_NAME','codeforage');

$con = new PDO( 'mysql:host='.DB_HOST.';dbname='.DB_NAME.';charset=utf8',DB_USER,DB_PASSWORD );
$con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

try {
    $query = $con->prepare( "SELECT steamid FROM steam_users WHERE steamid = ?" );
    $query->bindValue( 1, $steamprofile['steamid'], PDO::PARAM_STR );
    $query->execute();
} catch (Exception $e) {
    echo "oh noes!! there's an error...";
}

if( $query->rowCount() > 0 ) { # If rows are found for query
     echo "Email found!";
}
else {
    echo "Email not found!";
    $statement = $con->prepare("INSERT INTO steam_users(steamid) VALUES(' " . $steamprofile['steamid'] . " ')");
    $statement->execute();
}

?>