Issue#18604 fixed in this commit

Mahesh Singh · Mahesh Singh · commit 8296637b258a · 2018-10-14T16:13:41.000+05:30
diff --git a/app/code/Magento/Catalog/Pricing/Price/BasePrice.php b/app/code/Magento/Catalog/Pricing/Price/BasePrice.php
@@ -30,7 +30,7 @@ public function getValue()
             $this->value = false;
             foreach ($this->priceInfo->getPrices() as $price) {
                 if ($price instanceof BasePriceProviderInterface && $price->getValue() !== false) {
-                    $this->value = min($price->getValue(), $this->value ?: $price->getValue());
+                    $this->value = min($price->getValue(), $this->value !== false ?: $price->getValue());
                 }
             }
         }

Original file line number	Diff line number	Diff line change
`@@ -30,7 +30,7 @@ public function getValue()`
`30`	`30`	`$this->value = false;`
`31`	`31`	`foreach ($this->priceInfo->getPrices() as $price) {`
`32`	`32`	`if ($price instanceof BasePriceProviderInterface && $price->getValue() !== false) {`
`33`		`- $this->value = min($price->getValue(), $this->value ?: $price->getValue());`
	`33`	`+ $this->value = min($price->getValue(), $this->value !== false ?: $price->getValue());`
`34`	`34`	`}`
`35`	`35`	`}`
`36`	`36`	`}`