diff --git a/CHANGELOG.md b/CHANGELOG.md
index 256da35..47762fc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,9 +8,14 @@ Types of changes: `Added`, `Changed`, `Deprecate`, `Removed`, `Fixed`, `Secruity
 
 ## [Unreleased]
 
+### v2.6.2 - 12.12.2024 - New developer feature and bugfix for invoice logic
+
 ### Added
 - Added developer feature to show the executed SQL queries
 
+### Fixed
+- Fixed triggered exception if an invoice was set to "is paid" and saved
+
 ## v2.6.1 - 03.10.2024 - Bugfix in 'Revenue and Profits' view
 
 ### Fixed
diff --git a/app/Http/Controllers/InvoiceController.php b/app/Http/Controllers/InvoiceController.php
index 1557594..1194af9 100644
--- a/app/Http/Controllers/InvoiceController.php
+++ b/app/Http/Controllers/InvoiceController.php
@@ -97,7 +97,14 @@ public function update(): void
 
         foreach (Http::param('deliveryNote') as $deliveryNoteId) {
             $parts = explode('-', $deliveryNoteId);
-            DeliveryNote::findById($parts[0])
+            $deliveryNote = DeliveryNote::findById($parts[0]);
+
+            // Check if delivery note requires an update
+            if ($deliveryNote->getInvoiceId() === $invoice->getId()) {
+                continue;
+            }
+
+            $deliveryNote
                 ->setInvoiceId($parts[1] === "1" ? $invoice->getId(): null)
                 ->save();
         }
diff --git a/resources/Views/about.php b/resources/Views/about.php
index f9bb0b7..c69a711 100644
--- a/resources/Views/about.php
+++ b/resources/Views/about.php
@@ -5,7 +5,7 @@
 <table class="scrollable">
     <tr>
         <td>Bio-Manager Version</td>
-        <td class="right">2.6.1</td>
+        <td class="right">2.6.2</td>
     </tr>
     <tr>
         <td><?= __('Developer') ?></td>