diff --git a/Plugin/SetTaxClassId.php b/Plugin/SetTaxClassId.php
index 0f6a456..497fe80 100644
--- a/Plugin/SetTaxClassId.php
+++ b/Plugin/SetTaxClassId.php
@@ -70,6 +70,7 @@ public function afterAddRequiredData(Product $context)
 
         $mappings = $this->serializer->unserialize($mappings);
 
+        $this->tax_id_columns = [];
         foreach ($attributes as $attribute) {
             if ($attribute['magento_type'] === "tax") {
                 $this->tax_id_columns[] = $attribute['pim_type'];