The version of my magento2 is 2.3.5-p1.

Here is the problem: We will open the invoice view in backend. So we go to: ->Sales->orders->select an order ->go to Invoices->view

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Does someone has the same issue and were able to fix it? Any ideas how to fix it?

I am happy for any ideas!

Thanks for helping.

Totals.php enter image description here

public function afterGetTotals(\Magento\Sales\Block\Order\Totals $subject, ?array $totals)
    if (!is_array($totals)) {
        return null;
    foreach ($totals as $total) {
        if ($total->getCode() == 'discount') {
            if ($this->_coreRegistry->registry('current_order')->getAppliedRuleIds() == self::POS_CUSTOM_DISCOUNT
                && $this->_coreRegistry->registry('current_order')->getOsPosCustomDiscountAmount()) {
                $label = "Custom Discount";
                if ($this->_coreRegistry->registry('current_order')->getOsPosCustomDiscountType()
                    == self::PERCENT_PRICE_TYPE) {
                    $label .= sprintf(
                        " (%.2f%%)",
    return $totals;
  • Give the code of Totals.php
    – Harun
    Mar 29 at 6:29
  • I can't find a place to upload files.
    – Alex
    Mar 29 at 6:38
  • You don't need to upload files just copy and paste that particular code.
    – Harun
    Mar 29 at 6:42
  • I edited the question, the code and screenshots can be seen in the question, Thank you!
    – Alex
    Mar 29 at 6:45
  • I found these orders have the same feature, they are all using coupons.
    – Alex
    Mar 29 at 6:48

1 Answer 1


This line is checking whether the AppliedRuleIds value of the current order object is equal to self::POS_CUSTOM_DISCOUNT, and whether the OsPosCustomDiscountAmount value of the current order object is not empty.

If the current_order object is null or if the AppliedRuleIds value or OsPosCustomDiscountAmount value are not defined, then the code could result in a fatal error due to a null pointer exception.

To prevent the null pointer exception, you can add null checks to ensure that the current_order object is not null and that the values you are trying to access are defined before accessing them.

Use this code on line 29,

$currentOrder = $this->_coreRegistry->registry('current_order');
if ($currentOrder && $currentOrder->getAppliedRuleIds() == self::POS_CUSTOM_DISCOUNT
                && $currentOrder->getOsPosCustomDiscountAmount()) {
  • This is a great answer,it solved my problem perfectly, thank you so much.
    – Alex
    Mar 29 at 7:08
  • You're very welcome! I'm happy to help
    – Harun
    Mar 29 at 7:10

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