$kgFormsAllowed = false;
                        break;
                    }
                }
            }

            // Нормализуем и дедублицируем значения размера.
            $kgNormalizedSizes = [];
            $kgHasStopSize = false;

            foreach ($kgPavingSizes as $kgSize) {
                $kgSize = trim((string)$kgSize);

                if ($kgSize === '') {
                    continue;
                }

                if (preg_match('/^(Мультиформат|Крупноформатная|Широкоформатная)$/ui', $kgSize)) {
                    $kgHasStopSize = true;
                    break;
                }

                $kgNormalizedSizes[] = $kgSize;
            }

            $kgNormalizedSizes = array_values(array_unique($kgNormalizedSizes));

            if (
                !$kgIsClinker &&
                $kgMeasureAllowed &&
                $kgFormsAllowed &&
                !$kgHasStopSize &&
                count($kgNormalizedSizes) === 1
            ) {
                $kgSize = $kgNormalizedSizes[0];

                /*
                 * Строго один размер вида Длина x Ширина x Толщина.
                 * Значения с 4 числами и любые текстовые форматы не проходят.
                 */
                if (preg_match(
                    '/^\s*(\d+(?:[\.,]\d+)?)\s*[xх×]\s*(\d+(?:[\.,]\d+)?)\s*[xх×]\s*(\d+(?:[\.,]\d+)?)\s*$/u',
                    $kgSize,
                    $kgMatches
                )) {
                    $kgPavingLength = (float)str_replace(',', '.', $kgMatches[1]);
                    $kgPavingWidth = (float)str_replace(',', '.', $kgMatches[2]);

                    if ($kgPavingLength > 0 && $kgPavingWidth > 0) {
                        $kgMultiplier = (
                            $kgPavingLength *
                            $kgPavingWidth
                        ) / 1000000;
                    }
                }
            }
        }

        if ($kgMultiplier <= 0) {
            return null;
        }

        /*
         * Определяем текущую цену.
         * Для блоков это цена за м³, для плитки — цена за м².
         * Для SKU сначала используем цену выбранного торгового предложения.
         */
        $kgBasePrice = 0.0;
        $kgPrices = [];

        if (
            is_array($arCurrentSKU) &&
            !empty($arCurrentSKU['PRICES']) &&
            is_array($arCurrentSKU['PRICES'])
        ) {
            $kgPrices = $arCurrentSKU['PRICES'];
        } elseif (
            !empty($arItem['PRICES']) &&
            is_array($arItem['PRICES'])
        ) {
            $kgPrices = $arItem['PRICES'];
        }

        foreach ($kgPrices as $kgPrice) {
            if (!is_array($kgPrice)) {
                continue;
            }

            if (
                isset($kgPrice['DISCOUNT_VALUE']) &&
                (float)$kgPrice['DISCOUNT_VALUE'] > 0
            ) {
                $kgBasePrice = (float)$kgPrice['DISCOUNT_VALUE'];
                break;
            }

            if (
                isset($kgPrice['VALUE']) &&
                (float)$kgPrice['VALUE'] > 0
            ) {
                $kgBasePrice = (float)$kgPrice['VALUE'];
                break;
            }
        }

        /*
         * Резервный источник цены.
         */
        if (
            $kgBasePrice <= 0 &&
            !empty($arItem['MIN_PRICE']) &&
            is_array($arItem['MIN_PRICE'])
        ) {
            if (
                isset($arItem['MIN_PRICE']['DISCOUNT_VALUE']) &&
                (float)$arItem['MIN_PRICE']['DISCOUNT_VALUE'] > 0
            ) {
                $kgBasePrice = (float)$arItem['MIN_PRICE']['DISCOUNT_VALUE'];
            } elseif (
                isset($arItem['MIN_PRICE']['VALUE']) &&
                (float)$arItem['MIN_PRICE']['VALUE'] > 0
            ) {
                $kgBasePrice = (float)$arItem['MIN_PRICE']['VALUE'];
            }
        }

        if ($kgBasePrice <= 0) {
            return null;<pre>[RuntimeException] 
Could not start session because headers have already been sent. &quot;/home/s/sabon/sabon/public_html/bitrix/php_interface/include/price_per_piece.php&quot;:1. (0)
/home/s/sabon/sabon/public_html/bitrix/modules/main/lib/Session/Session.php:143
#0: Bitrix\Main\Session\Session-&gt;start()
	/home/s/sabon/sabon/public_html/bitrix/modules/main/lib/Session/KernelSessionProxy.php:47
#1: Bitrix\Main\Session\KernelSessionProxy-&gt;start()
	/home/s/sabon/sabon/public_html/bitrix/modules/main/include.php:151
#2: require_once(string)
	/home/s/sabon/sabon/public_html/bitrix/modules/main/include/prolog_before.php:19
#3: require_once(string)
	/home/s/sabon/sabon/public_html/bitrix/modules/main/include/prolog.php:10
#4: require_once(string)
	/home/s/sabon/sabon/public_html/bitrix/header.php:2
#5: require(string)
	/home/s/sabon/sabon/public_html/catalog/index.php:1
#6: include_once(string)
	/home/s/sabon/sabon/public_html/bitrix/modules/main/include/urlrewrite.php:128
#7: include_once(string)
	/home/s/sabon/sabon/public_html/bitrix/urlrewrite.php:2
----------
</pre>