Division by zero in Magento Bestseller Script - magento

Question

I found this script for displaying magentos bestsellers but I get a ERR (3): Warning: Division by zero on line 135 and 163 (see code below). I have been trying to fix it hours and gave up on it but the warning in my error logs bugs me. Can someone take a look and see if they can tell me what is wrong? Thanks
<?php
/**
* #author Branko Ajzele | http://activecodeline.com | branko.ajzele#surgeworks.com
* #license GPL
*/
/**
*
*
05/06/2011 Modified by Erik Gabor | erikvail#gmail.com | http://www.mage-contacts.com
* #license GPL
*/
$storeId = Mage::app()->getStore()->getId();
$totalPerPage = ($this->show_total) ? $this->show_total :1;
$counter = 1;
$visibility = array(
Mage_Catalog_Model_Product_Visibility::VISIBILITY_BOTH,
Mage_Catalog_Model_Product_Visibility::VISIBILITY_IN_CATALOG
);
$storeId = Mage::app()->getStore()->getId();
$_productCollection = Mage::getResourceModel('reports/product_collection')
->addAttributeToSelect('*')
->setStoreId($storeId)
->addStoreFilter($storeId)
->addOrderedQty()
->addAttributeToFilter('visibility', $visibility);
if ($current_category = Mage::registry('current_category'))
$_productCollection->addCategoryFilter($current_category);
$_productCollection->setPage(1,$totalPerPage);
$_productCollection->setOrder('ordered_qty', 'desc');
Mage::getSingleton('catalog/product_status')->addVisibleFilterToCollection($_productCollection);
Mage::getSingleton('catalog/product_visibility')->addVisibleInCatalogFilterToCollection($_productCollection);
$_helper = $this->helper('catalog/output');
//Mage_Reports_Model_Mysql4_Product_Collection
?>
<?php
$_collectionSize = $_productCollection->count();
if($current_category && $_collectionSize) :
?>
<div class="block">
<div class="block-title">
<strong><span><?php echo $current_category->getName() ?> <?php echo $this->__('Bestseller') ?></span></strong>
</div>
<?php else: ?>
<div class="block">
<div class="block-title">
<strong><span> <?php echo $this->__('Bestseller') ?></span></strong>
</div>
<?php endif;?>
<?php $_collectionSize = $_productCollection->count() ?>
<?php $_columnCount = $this->getColumnCount(); ?>
<?php $i=0; foreach ($_productCollection as $_product): ?>
RIGHT HERE LINE 135 ----> <?php if ($i++%$_columnCount==0): ?>
<ul>
<?php endif ?>
<li id="category-bettseller">
<img src="<?php echo $this->helper('catalog/image')->init($_product, 'small_image')->constrainOnly(TRUE)->keepAspectRatio(TRUE)->keepFrame(FALSE)->resize(195); ?>" width="195" height="284" alt="<?php echo $this->stripTags($this->getImageLabel($_product, 'small_image'), null, true) ?>" />
<h2 class="product-name" style="float:left;width:180px;margin:7px"><?php echo $_helper->productAttribute($_product, $_product->getName(), 'name') ?></h2>
<div style="float:left;width:180px;margin:7px">
<?php if($_product->getRatingSummary()): ?>
<?php echo $this->getReviewsSummaryHtml($_product, 'short') ?>
<?php endif; ?>
<?php echo Mage::helper('core')->currency($_product->getPrice()) ?>
<?php if($_product->isSaleable()): ?>
<button type="button" title="<?php echo $this->__('Add to Cart') ?>" class="button btn-cart" onclick="setLocation('<?php echo Mage::getUrl('checkout/cart/add', array('product' => $_product->getId())) ?>')"><span><span><?php echo $this->__('Add to Cart') ?></span></span></button>
<?php else: ?>
<p class="availability out-of-stock"><span><?php echo $this->__('Out of stock') ?></span></p>
<?php endif; ?>
<ul class="add-to-links">
<?php if ($this->helper('wishlist')->isAllow()) : ?>
<li><a id="wish" href="<?php echo $this->helper('wishlist')->getAddUrl($_product) ?>" class="link-wishlist"><?php echo $this->__('Add to Wishlist') ?></a></li>
<?php endif; ?>
<?php if($_compareUrl=$this->getAddToCompareUrl($_product)): ?>
<li><a id="compare" href="<?php echo $_compareUrl ?>" class="link-compare"><?php echo $this->__('Add to Compare') ?></a></li>
<?php endif; ?>
</ul>
</div>
</li>
RIGHT HERE LINE 163------> <?php if ($i%$_columnCount==0 || $i==$_collectionSize): ?>
</ul>
</div>
<?php endif ?>
<?php endforeach ?>

Answer 1

$_columnCount was either null or 0 so it was throwing division by zero error.
Changed $_columnCount to 1, and everything is working fine.