MAGETWO-83706: Scheduled Update to existing Group Price / Special Price removes the previously configured price, or results in changes not being saved

Author: le0n4eg

app/code/Magento/Catalog/Model/Product/Attribute/Backend/TierPrice/UpdateHandler.php

@@ -261,7 +261,7 @@ private function isWebsiteGlobal(int $websiteId): bool
     }
 
     /**
-     * @param $origPrices
+     * @param array|null $origPrices
      * @param bool $isGlobal
      * @return array
      */
@@ -281,7 +281,7 @@ private function prepareOriginalDataToCompare($origPrices, $isGlobal = true): ar
     }
 
     /**
-     * @param $priceRows
+     * @param array|null $priceRows
      * @param bool $isGlobal
      * @return array
      * @throws \Magento\Framework\Exception\LocalizedException