Can't place order after migration data from M1 to M2

When I try to place an order, it shows "Please choose a valid discount amount."

Solution:

Section responsible for that error looks like

        // Check if discount amount not negative

            if ($this->hasDiscountAmount()) {

                    if ((int)$this->getDiscountAmount() < 0) {

                        throw new \Magento\Framework\Exception\LocalizedException(__('Please choose a valid discount amount.'));

                }

        }

Check your cart rules after migration cause this error is thrown when the applied discount amount is less than 0.