diff --git a/account_ebics/__manifest__.py b/account_ebics/__manifest__.py
index a8457df..c0822b0 100644
--- a/account_ebics/__manifest__.py
+++ b/account_ebics/__manifest__.py
@@ -3,7 +3,7 @@
 
 {
     "name": "EBICS banking protocol",
-    "version": "17.0.1.0.1",
+    "version": "17.0.1.0.2",
     "license": "LGPL-3",
     "author": "Noviat",
     "website": "https://www.noviat.com",
diff --git a/account_ebics/wizards/ebics_change_passphrase.py b/account_ebics/wizards/ebics_change_passphrase.py
index b4b206d..05b05b6 100644
--- a/account_ebics/wizards/ebics_change_passphrase.py
+++ b/account_ebics/wizards/ebics_change_passphrase.py
@@ -1,4 +1,4 @@
-# Copyright 2009-2023 Noviat.
+# Copyright 2009-2024 Noviat.
 # License LGPL-3 or later (http://www.gnu.org/licenses/lgpl).
 
 import logging
@@ -76,7 +76,7 @@ class EbicsChangePassphrase(models.TransientModel):
                 "passphrase": passphrase,
             }
             if self.new_sig_pass:
-                keyring_params["sig_passphrase"] = self.old_sig_pass
+                keyring_params["sig_passphrase"] = self.old_sig_pass or None
             keyring = EbicsKeyRing(**keyring_params)
             change_params = {}
             if self.new_pass: