diff --git a/app/Models/Invoice.php b/app/Models/Invoice.php
index c98daa80c182..69a7fce64d12 100644
--- a/app/Models/Invoice.php
+++ b/app/Models/Invoice.php
@@ -47,6 +47,7 @@ class Invoice extends EntityModel implements BalanceAffecting
         'tax_name2',
         'tax_rate2',
         'private_notes',
+        'last_sent_date',
     ];
 
     /**
diff --git a/app/Ninja/Repositories/InvoiceRepository.php b/app/Ninja/Repositories/InvoiceRepository.php
index 878026b80f35..cf7ffb09bf91 100644
--- a/app/Ninja/Repositories/InvoiceRepository.php
+++ b/app/Ninja/Repositories/InvoiceRepository.php
@@ -420,7 +420,7 @@ class InvoiceRepository extends BaseRepository
         }
 
         if ($invoice->is_recurring) {
-            if (isset($data['start_date']) && $invoice->start_date && $invoice->start_date != Utils::toSqlDate($data['start_date'])) {
+            if (! $isNew && isset($data['start_date']) && $invoice->start_date && $invoice->start_date != Utils::toSqlDate($data['start_date'])) {
                 $invoice->last_sent_date = null;
             }