Onlogische foutmeldingen

Ik krijg onderstaande volgende foutmeldingen
en ik denk dat ik deze undefined foutmelding kan weghalen door de PHP code anders te laten beeindigen... en juist hier kom ik niet uit....

<?php
if (isset($_POST['submit'])) {
    // hier voer je je query uit
    if (!$search_query) {
        // foutmelding
    }
    
    if ($count == 0) {
        // geen resultaten
    } else {
        while ($row2 = mysqli_fetch_assoc($search_query)) {
            // while loop die continu resultaten overschrijft in variabelen
        }        
    }
    // hier druk je één resultaat af, ook al zijn er meerdere, of geen...
}
?>

<?php
// is er een formulier gesubmit?
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // voer query uit
    $result = mysqli_query($connection, '... je query ...');
    // zijn er resultaten?
    if (mysqli_num_rows($result) == 0) {
        ?><p>Geen resultaten gevonden.</p><?php
    } else {
        // doorloop resultaten...
        while ($row = mysqli_fetch_assoc($result)) {
            // ... en druk deze hier direct af met behulp van $row
        }
    }
    // geef resultaten vrij
    mysqli_free_result($result);
}
?>

<?php include "includes/db-config.php"; ?>
<?php include "includes/header.php"; ?>
<?php
if(isset($_POST['submit']) & !empty($_POST['submit'])){
$search = $_POST['search'];
$query = "SELECT * FROM medicines ";
$query .= "WHERE med_name LIKE '%$search%'";
$search_query = mysqli_query($connection,$query);
if(!$search_query){
	die(mysqli_error($connection));
	}
	
$count = mysqli_num_rows($search_query);
if($count == 0){
	echo "No result found";
	
	} else {
		echo "<table width='70%' border='solid 1px;'>";
echo "<tr><th>Name</th><th>Production_Date</th><th>Expire_Date</th><th>Created by factory</th><th>Added to database</th><th>Edit</th><th>Delete</th></tr>";
while ($row2 = mysqli_fetch_assoc($search_query)){
		$medicine_id = $row2['med_id'];
		$medicine_name = $row2['med_name'];
		$medicine_create_date = $row2['med_create_date'];
		$medicine_expire_date = $row2['med_expire_date'];
		$medicine_factory = $row2['med_factory_id'];
		$medicine_register_date = $row2['med_register_date'];
		echo "<tr>";
		echo "<td>{$medicine_name}</td>" .
			 "<td>{$medicine_create_date}</td>" .
			 "<td>{$medicine_expire_date}</td>" .
			 "<td>{$medicine_factory}</td>" .
			 "<td>{$medicine_register_date}</td>" .
			 "<td><a href='edit.php?id={$medicine_id}'>Edit</a></td>" .
			 "<td><a href='delete.php?id={$medicine_id}'>Delete</a></td>";
		echo "</tr>";
		}
echo "</table>";		
}
?>
<div id="content">
<h1>Search Results</h1>
<?php } ?>
</div>
<?php include "includes/footer.php"; ?>