diff --git a/CHANGELOG.md b/CHANGELOG.md
index c25a99ff..54f436da 100755
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,11 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [1.2.5.1][1.2.5.1]
+
+### Fix
+*   A bug which led to an error when trying to cancel the initial transaction of a charged invoice.
+
 ## [1.2.5.0][1.2.5.0]
 
 ### Added
@@ -332,3 +337,4 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 [1.2.3.0]: https://github.com/heidelpay/heidelpayPHP/compare/1.2.2.0..1.2.3.0
 [1.2.4.0]: https://github.com/heidelpay/heidelpayPHP/compare/1.2.3.0..1.2.4.0
 [1.2.5.0]: https://github.com/heidelpay/heidelpayPHP/compare/1.2.4.0..1.2.5.0
+[1.2.5.1]: https://github.com/heidelpay/heidelpayPHP/compare/1.2.5.0..1.2.5.1
diff --git a/src/Heidelpay.php b/src/Heidelpay.php
index 9eb65262..4402db82 100755
--- a/src/Heidelpay.php
+++ b/src/Heidelpay.php
@@ -58,7 +58,7 @@ class Heidelpay implements HeidelpayParentInterface
     const BASE_URL = 'api.heidelpay.com';
     const API_VERSION = 'v1';
     const SDK_TYPE = 'HeidelpayPHP';
-    const SDK_VERSION = '1.2.5.0';
+    const SDK_VERSION = '1.2.5.1';
 
     /** @var string $key */
     private $key;
diff --git a/src/Resources/Payment.php b/src/Resources/Payment.php
index 9df4e8c0..b7c6724c 100755
--- a/src/Resources/Payment.php
+++ b/src/Resources/Payment.php
@@ -713,6 +713,7 @@ public function cancelAmount(
             } catch (HeidelpayApiException $e) {
                 $allowedErrors = [
                     ApiResponseCodes::API_ERROR_ALREADY_CANCELLED,
+                    ApiResponseCodes::API_ERROR_ALREADY_CHARGED,
                     ApiResponseCodes::API_ERROR_ALREADY_CHARGED_BACK
                 ];
 
diff --git a/test/unit/Resources/PaymentCancelTest.php b/test/unit/Resources/PaymentCancelTest.php
index 47a89939..bb17815a 100644
--- a/test/unit/Resources/PaymentCancelTest.php
+++ b/test/unit/Resources/PaymentCancelTest.php
@@ -426,7 +426,8 @@ public function allowedErrorCodesDuringChargeCancel(): array
     {
         return [
             'already cancelled' => [ApiResponseCodes::API_ERROR_ALREADY_CANCELLED, false],
-            'already chargedBack' => [ApiResponseCodes::API_ERROR_ALREADY_CANCELLED, false],
+            'already charged' => [ApiResponseCodes::API_ERROR_ALREADY_CHARGED, false],
+            'already chargedBack' => [ApiResponseCodes::API_ERROR_ALREADY_CHARGED_BACK, false],
             'other' => [ApiResponseCodes::API_ERROR_BASKET_ITEM_IMAGE_INVALID_URL, true]
         ];
     }