Woocommerce next previous product with image thumbnail

gistfile1.txt

<div class="next-prev-page">
  <span class="inner">
  
	<?php 
		$prevPost = get_previous_post(); 
		$prevThumbnail = get_the_post_thumbnail($prevPost->ID, array(150,150) ); 
		$prevLink = get_permalink( $prevPost->ID );	
	?>
    <?php if($prevPost){ ?>
		<a class="prev" href="<?php echo $prevLink; ?>">
			<?php print_r($prevThumbnail);?>
			<i class="icon-arrow4-left"></i>
		</a>
    <?php } ?>
	
	
	
	
	<?php 
		$nextPost = get_next_post(); 	
		$nextLink = get_permalink( $nextPost->ID );
	?>
    
	<?php if($nextPost) { ?>
		<a class="next" href="<?php echo $nextLink; ?>">
			<i class="icon-arrow4-right"></i>
			<?php
			$nextThumbnail = get_the_post_thumbnail($nextPost->ID, array(150,150) ); 
			print_r($nextThumbnail); ?>
		</a>
    <?php } ?>
  </span>
</div>