Datenbankabfrage per PHP schlägt fehl ohne fehlermeldung

CREATE TABLE IF NOT EXISTS `tbl_users` (
  `name` varchar(256) NOT NULL,
  `uuid` varchar(256) NOT NULL,
  `oper` varchar(256) NOT NULL,
  `time` varchar(256) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

<?php
require_once ('settings.php');  
$db_link = mysqli_connect (
                     $servername, 
                     $username, 
                     $password, 
                     $dbname
                    );
$sql = "SELECT * FROM tbl_users";  
 
$db_erg = mysqli_query( $db_link, $sql );
if ( ! $db_erg )
{
  die('Ungültige Abfrage: ' . mysqli_error());  
}
 echo
'  
	</br></br></br></br><center><h3>Whitelistet Users</h3></center></br></br><title>| Gaming-Squad | Abusesystem |</title>
    <table align="center" border="0">  
        <tr>
            <td width="200" align="center">Spieler</td>  
            <td width="200" align="center">UUID</td>  
			<td width="200" align="center">Admin</td>  
        </tr>
';    

while ($zeile = mysqli_fetch_array( $db_erg, MYSQL_ASSOC))
{
  echo "<tr>";  
  echo "<td width='200' align='center'>". $zeile['name'] ."</td>";  
  echo "<td width='200' align='center'>". $zeile['uuid'] ."</td>";  
  echo "<td width='200' align='center'>". $zeile['oper'] ."</td>";  
  echo "</tr>";  
}
echo "</table>";  
echo"</br>";  
echo "<center><a href='http://mcabuse.gaming-squad.eu/index.php'>Abuse-Verzeichniss</a></center>";   
echo"</br>";  
echo"</br>";  
echo"</br>";  
echo"</br>";  
echo"</br>";  
echo"</br>";  
echo"</br>";  
echo"</br>";  
echo "<div align='right'>Copyright by &copy;Gaming-Squad.eu&nbsp;&nbsp;&nbsp;&nbsp;</br>  
WebGui f&uuml;r Gaming-Squad.eu - MC-Server erstellt von Kimahri&nbsp;&nbsp;&nbsp;&nbsp;
</div>";  
mysqli_free_result( $db_erg );
?>