diff --git a/app/Ninja/Repositories/InvoiceRepository.php b/app/Ninja/Repositories/InvoiceRepository.php
index 1ef8ff93986f..853ec2b5d814 100644
--- a/app/Ninja/Repositories/InvoiceRepository.php
+++ b/app/Ninja/Repositories/InvoiceRepository.php
@@ -1025,7 +1025,7 @@ class InvoiceRepository extends BaseRepository
         if ($location == FEE_LOCATION_ITEM) {
             // todo
         } else {
-            if ($invoice->$field > 0) {
+            if ($invoice->$location > 0) {
                 $data = $invoice->toArray();
                 $data[$location] = 0;
                 $invoice = $this->save($data, $invoice);