Index: /lib/wpsg_calculation.class.php
===================================================================
--- /lib/wpsg_calculation.class.php	(revision 8445)
+++ /lib/wpsg_calculation.class.php	(revision 8446)
@@ -1855,5 +1855,5 @@
 				$this->arCalculation['tax'][$tax_key] = [
 					'key' => $tax_key,
-					'tax_value' => ((intval($tax_key) !== 0 && isset($this->arCountry[$arTaxKey[1]][$tax_key]))?$this->arCountry[$arTaxKey[1]][$tax_key]:0),
+					'tax_value' => (($tax_key !== '0' && isset($this->arCountry[$arTaxKey[1]][$tax_key]))?$this->arCountry[$arTaxKey[1]][$tax_key]:0),
 					'netto' => 0,
 					'brutto' => 0