Баг. Обнаружена ошибка при сохранении инфоблока.

[TypeError] 
mb_strlen(): Argument #1 ($string) must be of type string, array given (0)
.../bitrix/modules/iblock/classes/general/iblockproperty.php:515
#0: mb_strlen
   .../bitrix/modules/iblock/classes/general/iblockproperty.php:515
#1: CAllIBlockProperty->Update
   .../bitrix/modules/iblock/admin/iblock_edit.php:1000
#2: require(string)
   .../bitrix/admin/iblock_edit.php:1

               if(is_array($arValue) && isset($arValue["VALUE"]) && mb_strlen($arValue["VALUE"]))
                  $arFields["DEFAULT_VALUE"] = $arValue["VALUE"];
               else
                  $arFields["DEFAULT_VALUE"] = false;

array(1) {
  [0]=>
  string(0) ""
}