diff --git a/app/ninja/repositories/InvoiceRepository.php b/app/ninja/repositories/InvoiceRepository.php
index c364cb569b9c..83efff8bcd8a 100755
--- a/app/ninja/repositories/InvoiceRepository.php
+++ b/app/ninja/repositories/InvoiceRepository.php
@@ -346,7 +346,7 @@ class InvoiceRepository
 
             $invoiceItem = InvoiceItem::createNew();
             $invoiceItem->product_id = isset($product) ? $product->id : null;
-            $invoiceItem->product_key = trim($invoice->is_recurring ? $item->product_key : Utils::processVariables($item['product_key']));
+            $invoiceItem->product_key = trim($invoice->is_recurring ? $item['product_key'] : Utils::processVariables($item['product_key']));
             $invoiceItem->notes = trim($invoice->is_recurring ? $item['notes'] : Utils::processVariables($item['notes']));
             $invoiceItem->cost = Utils::parseFloat($item['cost']);
             $invoiceItem->qty = Utils::parseFloat($item['qty']);