diff --git a/intaro.retailcrm/lib/icml/icmlwriter.php b/intaro.retailcrm/lib/icml/icmlwriter.php
index e9f00353..876db677 100644
--- a/intaro.retailcrm/lib/icml/icmlwriter.php
+++ b/intaro.retailcrm/lib/icml/icmlwriter.php
@@ -175,8 +175,10 @@ class IcmlWriter
      */
     private function writeOptionalSimpleElement(string $name, $value, bool $isEmptyAllowed = false): void
     {
-        if (!empty($value) || $isEmptyAllowed) {
+        if (!empty($value)) {
             $this->writeSimpleElement($name, $value);
+        } elseif ($isEmptyAllowed && $name === 'purchasePrice') {
+            $this->writeSimpleElement($name, 0);
         }
     }