php - warning division by zero woocommerce category -

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i'm function, on single product page works fine. on category page keeps telling me: 'warning: division 0 in'. help!

add_filter( 'woocommerce_sale_price_html', 'woocommerce_custom_sales_price', 10, 2 );  function woocommerce_custom_sales_price( $price, $product ) {      $percentage = round( ( ( $product->regular_price - $product->sale_price ) / $product->regular_price ) * 100 );  if ($percentage < 0) { return null;}  else {      if (is_product()) {         return $price . sprintf( __('<br><span style="font-size:14px;font-weight:bold; color:#ef4136">-%s de desconto</span>', 'woocommerce' ), $percentage . '%' );}      else {         return $price . sprintf( __('<span style="font-size:14px;font-weight:bold; color:#ef4136">-%s de desconto</span>', 'woocommerce' ), $percentage . '%' );}     } } 

        function woocommerce_custom_sales_price( $price, $product ) {         if($product->regular_price > 0 ){ // check if have set regular price of product.             $percentage = round( ( ( $product->regular_price - $product->sale_price ) / $product->regular_price ) * 100 ); }          if ($percentage < 0) { return null;}          else {              if (is_product()) {                 return $price . sprintf( __('<br><span style="font-size:14px;font-weight:bold; color:#ef4136">-%s de desconto</span>', 'woocommerce' ), $percentage . '%' );}              else {                 return $price . sprintf( __('<span style="font-size:14px;font-weight:bold; color:#ef4136">-%s de desconto</span>', 'woocommerce' ), $percentage . '%' );}             }         }

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