List of products displayed from database using PHP. When product selected javascript function called to enter product into HMTL form field.

<div id="addProductPanel">
 <div class="popularProduct">Popular products</div>
 <div class="closeButton" onclick="closePopularProductWindow()">X</div>
 <?php
 $query_popular_product="SELECT product_code FROM database_table GROUP BY product_code ORDER BY product_code DESC";
      $result_popular_product = $link->query($query_popular_product);
      while($row = $result_popular_product->fetch_assoc()) {
        $product_code = $row['product_code'];
        echo '<div class="popularProduct" onclick="setProduct("'.$product_code.'")">'.$product_code.'</div>';
      }
 ?>
</div>

The js function setProduct is:

function setProduct(product) {
    console.log(product);
    document.getElementsByName("product")[0].value = product;
    document.getElementById("addProductPanel").style.display = "none";
}

When loading the page and using Chrome inspector console, selecting a product doesn't print the product in the console and produces the error Uncaught SyntaxError: Unexpected end of input with HTML displayed as below:

<div class="popularProduct" onclick="setProduct("PROD123")">PROD123</div>

I have tried typing the following HTML and this works successfully with the javascript function:

<div class="popularProduct" onclick="setProduct('PROD123')">PROD123</div>

Cannot get the PHP syntax working with the product values from the database.