custom filed in product_form opencart 2.1.0.2

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<div class="form-group has-error">
           <label class="col-sm-2 control-label" for="input-seller-price"><?php echo $entry_seller_price; ?></label>
                <div class="col-sm-10">
                  <input type="text" name="seller-price" value="<?php echo $seller_price; ?>" placeholder="<?php echo $entry_seller_price; ?>" id="input-seller-price" class="form-control" />
                </div>
              </div>

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seller_price = '" . $this->db->escape($data['seller_price']) . "',

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if (isset($this->request->post['seller_price'])) {
			$data['seller_price'] = $this->request->post['seller_price'];
		} elseif (!empty($product_info)) {
			$data['seller_price'] = $product_info['seller_price'];
		} else {
			$data['seller_price'] = ';
		}

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'seller_price'     => $query->row['seller_price'],

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PHP Notice:  Undefined index: seller_price in model\catalog\product.php on line 131

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$sql .= " OR LCASE(p.seller_price) = '" . $this->db->escape(utf8_strtolower($data['filter_name'])) . "'";

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public function getProduct($product_id) {

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return array(

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p.image, p.seller_price