Почему не записываются данные в БД?

<?php
	session_start();
	$db = mysqli_connect('localhost', 'root', '', 'register');
	$name = $_SESSION['name'];
	$password = $_SESSION['password'];
	
	$id = "";
	$block  = "";
	if(isset($_POST['deposit'])){
		$id = $_POST['id'];
		$wal = $_POST['wallets'];
		$amount = $_POST['dep-amount'];
		function getToken($length){
			$token = "";
			$codeAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
			$codeAlphabet.= "abcdefghijklmnopqrstuvwxyz";
			$codeAlphabet.= "0123456789";
			$max = strlen($codeAlphabet); // edited

		    for ($i=0; $i < $length; $i++) {
		        $token .= $codeAlphabet[random_int(0, $max-1)];
		    }

	    	return $token;
		}
		$d_key = getToken(34);
		$status = "Processing";
		$time = date("Y-m-d H:i:s");
		mysqli_query($db, "INSERT INTO deposit (amount, currency, address, status) VALUES ('$amount','$wal','$d_key','$status') ");

		
	}
		$con = mysqli_query($db, "SELECT * FROM deposit WHERE id = '$id' ");
		$row = mysqli_fetch_array($con);

		$block = "<div class='dep-modal'><div class='container'><div class='dep-content'><span class='close'>X</span><span class='number'>Payment # ".$status.$time."</span>
				<span class='d-text'>Send exactly ".$amount.$wal." at</span>
				<span class='d-key'><input type='text' name='d-key' value='".$d_key."'></span>
				<span class='bottom-text'>Your payment will be completed after confirmation by the network. Confirmation time may vary and depends on the Commission</span>
				</div>
				</div>
			</div>";
	
?>