[PHP/MYSQL] Problem mit einem Error...

<div id="divi1">
				<div id="divi2">
					<h2>Registrieren</h2>
					</br>
					<form method="post">
					   <input type="hidden" name="id" value="1"/>
					   <a>Username</a>
					   <input type="text" name="Username" value="1"/></br>
					   <a>Passwort</a>
					   <input type="password" name="password" value="passwort"/></br>
					   <a>Email Adresse</a>
					   <input type="text" name="EmailAdresse" value="Email"/></br>
					   <input type="submit" value="Registrieren"/>
					</form>
					<a href="?id=1"/>
					<?php
						if ($_POST["id"] == 1)
						{
							$query = $pdo->prepare("INSERT INTO user (Name,password,email) VALUES(:Name,:password,:email)");
							$query->execute(array(':Name' => $_POST["Username"], ':password' => $_POST["password"], ':email' => $_POST["EmailAdresse"]));
						}	
					?>
					</br>
					</br>
				</div>

<div id="divi1">
		<div id="divi2">
			<h2>Bestelliste</h2>
			</br>
			<?php
				$query = $pdo->query("SELECT Name FROM produkte");
				$price1 = $pdo->query("SELECT Price FROM produkte");
				$anzahl = $pdo->query("SELECT Anzahl FROM produkte");
				$query->setFetchMode(PDO::FETCH_OBJ);
				$anzahl->setFetchMode(PDO::FETCH_OBJ);
				$price = number_format($price1, 2, '.', ',')*$anzahl;
			?>
			<table  border="3" cellspacing="2" cellpadding="1">
			       <tr>
				     <th>Name</th><th>Preis</th><th>Anzahl</th>
				</tr>
				<tr>
				      <th><?php while($row = $query->fetch()) { echo $row->Name . "\n"; } ?></th>
					<th><?php echo $price ?></th>
					<th><?php while($row = $anzahl->fetch()) { echo $row->Anzahl. "\n"; } ?></th>
				</tr>
			</table>
			<div id="menu_buy">
					<a href='/files/sell/sell.php'>
						<button class="menu_item" id="menu_sell">Zur&uuml;ck</button>
					</a>
				</div>
				</br>
			</div>
		</div>