Checkout button no longer working (sagepay)

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2018-06-15 8:23:22 - PHP Notice:  Undefined variable: data in /var/www/vhosts/domain.com/httpdocs/catalog/model/payment/sagepay_direct_v3.php on line 150

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	public function sendCurl($url, $payment_data, $i = null) {
		$curl = curl_init($url);

		curl_setopt($curl, CURLOPT_PORT, 443);
		curl_setopt($curl, CURLOPT_HEADER, 0);
		curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($curl, CURLOPT_FOLLOWLOCATION, false);
		curl_setopt($curl, CURLOPT_FORBID_REUSE, 1);
		curl_setopt($curl, CURLOPT_FRESH_CONNECT, 1);
		curl_setopt($curl, CURLOPT_POST, 1);
		curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($payment_data));

		$response = curl_exec($curl);

		curl_close($curl);

		$response_info = explode(chr(10), $response);

		foreach ($response_info as $string) {
			if (strpos($string, '=') && isset($i)) {
				$parts = explode('=', $string, 2);
				$data['RepeatResponseData_' . $i][trim($parts[0])] = trim($parts[1]);
			} elseif (strpos($string, '=')) {
				$parts = explode('=', $string, 2);
				$data[trim($parts[0])] = trim($parts[1]);
			}
		}
		return $data;
	}