Adding Woocommerce Product Image Thumbnail to Group Products

i am trying to add a thumbnail image to all the grouped products, I have looked through and found this code that seems to work for most people with the same issue. However, it giving me and error and it’s beyond my skills and I hope someone can help me out.

Here is the code that I found on StackOverflow

<?php
/**
 * Grouped product add to cart
 *
 * @author 		WooThemes
 * @package 	WooCommerce/Templates
 * @version     2.1.7
 */


if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

global $product, $post, $image_size;
$image_size = array( 50, 50 );// array( width, height ) image size in pixel

$parent_product_post = $post;

do_action( 'woocommerce_before_add_to_cart_form' ); ?>

<form class="cart" method="post" enctype='multipart/form-data'>
	<table cellspacing="0" class="group_table">
		<tbody>
			<?php
				foreach ( $grouped_products as $product_id ) :
					$product = wc_get_product( $product_id );

					if ( 'yes' === get_option( 'woocommerce_hide_out_of_stock_items' ) && ! $product->is_in_stock() ) {
						continue;
					}

					$post    = $product->post;
					setup_postdata( $post );
					?>
					<tr>
						<?php $attachment_id = get_post_meta( $product->id, '_thumbnail_id', true ); ?>
						<td class="gpThumbs">
							<?php echo wp_get_attachment_image( $attachment_id, $image_size ); ?>	
						</td>
						

						<td class="label">
							<label for="product-<?php echo $product_id; ?>">
								<?php echo $product->is_visible() ? '<a href="' . get_permalink() . '">' . get_the_title() . '</a>' : get_the_title(); ?>
							</label>
						</td>

						<?php do_action ( 'woocommerce_grouped_product_list_before_price', $product ); ?>
						
						<td class="price">
							<?php
								echo $product->get_price_html();

								if ( $availability = $product->get_availability() ) {
									$availability_html = empty( $availability['availability'] ) ? '' : '<p class="stock ' . esc_attr( $availability['class'] ) . '">' . esc_html( $availability['availability'] ) . '</p>';
									echo apply_filters( 'woocommerce_stock_html', $availability_html, $availability['availability'], $product );
								}
							?>
						</td>
						<td>
							<?php if ( $product->is_sold_individually() || ! $product->is_purchasable() ) : ?>
								<?php woocommerce_template_loop_add_to_cart(); ?>
							<?php else : ?>
								<?php
									$quantites_required = true;
									woocommerce_quantity_input( array( 'input_name' => 'quantity[' . $product_id . ']', 'input_value' => '0', 'min_value' => apply_filters( 'woocommerce_quantity_input_min', 0, $product ), 'max_value' => apply_filters( 'woocommerce_quantity_input_max', $product->backorders_allowed() ? '' : $product->get_stock_quantity(), $product ) ) );
								?>
							<?php endif; ?>
						</td>
						
					</tr>
					<?php
				endforeach;

				// Reset to parent grouped product
				$post    = $parent_product_post;
				$product = wc_get_product( $parent_product_post->ID );
				setup_postdata( $parent_product_post );
			?>
		</tbody>
	</table>

	<input type="hidden" name="add-to-cart" value="<?php echo esc_attr( $product->id ); ?>" />

	<?php if ( $quantites_required ) : ?>

		<?php do_action( 'woocommerce_before_add_to_cart_button' ); ?>

		<button type="submit" class="single_add_to_cart_button button alt"><?php echo $product->single_add_to_cart_text(); ?></button>

		<?php do_action( 'woocommerce_after_add_to_cart_button' ); ?>

	<?php endif; ?>
</form>

<?php do_action( 'woocommerce_after_add_to_cart_form' ); ?>

And this is the error i get

Warning: Invalid argument supplied for foreach() in /home/papereskimo/public_html/wp-content/themes/papereskimo/woocommerce/single-product/add-to-cart/simple.php on line 26

Can anyone help me out!?!?!?

Read more here: Adding Woocommerce Product Image Thumbnail to Group Products

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