接口：/api/v2/order/check
报错信息：Illegal offset type in isset or empty
相关代码：
```
foreach ($merchantCart['list'] as &$cart) {
$_cartNum++;
if ($cart['product']['cate_id']) {
if (!isset($catePriceLst[$cart['product']['cate_id']])) {
$catePriceLst[$cart['product']['cate_id']] = ['price' => 0, 'cart' => []];
}
$catePriceLst[$cart['product']['cate_id']]['price'] = bcadd($catePriceLst[$cart['product']['cate_id']]['price'], $cart['true_price']);
$catePriceLst[$cart['product']['cate_id']]['cart'][] = &$cart;
}
}
```
