diff --git a/app/Api/V1/Requests/Models/Transaction/StoreRequest.php b/app/Api/V1/Requests/Models/Transaction/StoreRequest.php
index 8ae39522d5..74e8abc513 100644
--- a/app/Api/V1/Requests/Models/Transaction/StoreRequest.php
+++ b/app/Api/V1/Requests/Models/Transaction/StoreRequest.php
@@ -139,14 +139,14 @@ class StoreRequest extends FormRequest
                 'bunq_payment_id'       => $this->clearString((string)$object['bunq_payment_id'], false),
                 'external_uri'          => $this->clearString((string)$object['external_uri'], false),
 
-                'sepa_cc'       => $this->clearString($object['sepa_cc'], false),
-                'sepa_ct_op'    => $this->clearString($object['sepa_ct_op'], false),
-                'sepa_ct_id'    => $this->clearString($object['sepa_ct_id'], false),
-                'sepa_db'       => $this->clearString($object['sepa_db'], false),
-                'sepa_country'  => $this->clearString($object['sepa_country'], false),
-                'sepa_ep'       => $this->clearString($object['sepa_ep'], false),
-                'sepa_ci'       => $this->clearString($object['sepa_ci'], false),
-                'sepa_batch_id' => $this->clearString($object['sepa_batch_id'], false),
+                'sepa_cc'       => $this->clearString((string)$object['sepa_cc'], false),
+                'sepa_ct_op'    => $this->clearString((string)$object['sepa_ct_op'], false),
+                'sepa_ct_id'    => $this->clearString((string)$object['sepa_ct_id'], false),
+                'sepa_db'       => $this->clearString((string)$object['sepa_db'], false),
+                'sepa_country'  => $this->clearString((string)$object['sepa_country'], false),
+                'sepa_ep'       => $this->clearString((string)$object['sepa_ep'], false),
+                'sepa_ci'       => $this->clearString((string)$object['sepa_ci'], false),
+                'sepa_batch_id' => $this->clearString((string)$object['sepa_batch_id'], false),
                 // custom date fields. Must be Carbon objects. Presence is optional.
                 'interest_date' => $this->dateFromValue($object['interest_date']),
                 'book_date'     => $this->dateFromValue($object['book_date']),