diff --git a/app/Ninja/Repositories/InvoiceRepository.php b/app/Ninja/Repositories/InvoiceRepository.php
index 4b174c05f7..0bcecd5cf2 100644
--- a/app/Ninja/Repositories/InvoiceRepository.php
+++ b/app/Ninja/Repositories/InvoiceRepository.php
@@ -448,7 +448,9 @@ class InvoiceRepository extends BaseRepository
                 $invoice->due_date = $data['due_date'];
             }
         } else {
-            if (! empty($data['due_date']) || ! empty($data['due_date_sql'])) {
+            if ($isNew && empty($data['due_date']) && $invoice->due_date) {
+                // do nothing
+            } elseif (isset($data['due_date']) || isset($data['due_date_sql'])) {
                 $invoice->due_date = isset($data['due_date_sql']) ? $data['due_date_sql'] : Utils::toSqlDate($data['due_date']);
             }
             $invoice->frequency_id = 0;