diff --git a/app/Models/Invoice.php b/app/Models/Invoice.php
index 086bc0a1f97c..8a375e84fdbd 100644
--- a/app/Models/Invoice.php
+++ b/app/Models/Invoice.php
@@ -46,6 +46,7 @@ class Invoice extends EntityModel implements BalanceAffecting
         'tax_rate1',
         'tax_name2',
         'tax_rate2',
+        'last_sent_date',
     ];
 
     /**
diff --git a/app/Ninja/Repositories/InvoiceRepository.php b/app/Ninja/Repositories/InvoiceRepository.php
index 0bf6cf2adbf9..3e932e9e1b53 100644
--- a/app/Ninja/Repositories/InvoiceRepository.php
+++ b/app/Ninja/Repositories/InvoiceRepository.php
@@ -419,7 +419,7 @@ 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;
             }