PHP Notice: Undefined variable

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            <div class="col-sm-10">
              <select name="creditcard_geo_zone_id" id="input-geo-zone" class="form-control">
                <option value="0"><?php echo $text_all_zones; ?></option>
                <?php foreach ($geo_zones as $geo_zone) { ?>
                <?php if ($geo_zone['geo_zone_id'] == $creditcard_geo_zone_id) { ?> (Line 60 with error.) 
                <option value="<?php echo $geo_zone['geo_zone_id']; ?>" selected="selected"><?php echo $geo_zone['name']; ?></option>
                <?php } else { ?>
                <option value="<?php echo $geo_zone['geo_zone_id']; ?>"><?php echo $geo_zone['name']; ?></option>
                <?php } ?>
                <?php } ?>
              </select>
            </div>

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<?php
class ModelPaymentPPPro extends Model {
	public function getMethod($address, $total) {
		$this->language->load('payment/creditcard');

		$query = $this->db->query("SELECT * FROM " . DB_PREFIX . "zone_to_geo_zone WHERE geo_zone_id = '" . (int)$this->config->get('creditcard_geo_zone_id') . "' AND country_id = '" . (int)$address['country_id'] . "' AND (zone_id = '" . (int)$address['zone_id'] . "' OR zone_id = '0')");

		if ($this->config->get('creditcard_total') > 0 && $this->config->get('creditcard_total') > $total) {
			$status = false;
		} elseif (!$this->config->get('creditcard_geo_zone_id')) {
			$status = true;
		} elseif ($query->num_rows) {
			$status = true;
		} else {
			$status = false;
		}

		$method_data = array();

		if ($status) {
			$method_data = array(
				'code'       => 'creditcard',
				'title'      => $this->language->get('text_title'),
				'terms'      => '',
				'sort_order' => $this->config->get('creditcard_sort_order')
			);
		}

		return $method_data;
	}
}

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if (isset($this->request->post['creditcard_geo_zone_id'])) {
			$data['creditcard_geo_zone_id'] = $this->request->post['creditcard_geo_zone_id'];
		} else {
			$data['creditcard_geo_zone_id'] = $this->config->get('creditcard_geo_zone_id');
		}

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<?php
class ModelPaymentCreditcard extends Model {