Improve balance formatting by handling numeric validation

Improve balance formatting by handling numeric validation

- Removed unnecessary typecasting to integer in balance formatting.
- Added numeric validation to ensure the balance is properly formatted.
- Preserved floating-point precision by casting the balance to float.
- This change ensures that non-numeric balances default to 0, preventing potential errors while retaining accuracy in currency formatting.

upload/admin/controller/marketing/affiliate.php

@@ -349,7 +349,7 @@ protected function getList(): string {
 				'name'        => $result['name'],
 				'tracking'    => $result['tracking'],
 				'commission'  => $result['commission'],
-				'balance'     => $this->currency->format($result['balance'], $this->config->get('config_currency')),
+				'balance'     => $this->currency->format(is_numeric($result['balance']) ? (float)$result['balance'] : 0, $this->config->get('config_currency')),
 				'status'      => $result['status'],
 				'date_added'  => date($this->language->get('date_format_short'), strtotime($result['date_added'])),
 				'customer'    => $this->url->link('customer/customer.form', 'user_token=' . $this->session->data['user_token'] . '&customer_id=' . $result['customer_id']),