diff --git a/src/pretix/base/models/orders.py b/src/pretix/base/models/orders.py
index 698a0a602..f48e7dd63 100644
--- a/src/pretix/base/models/orders.py
+++ b/src/pretix/base/models/orders.py
@@ -3410,7 +3410,7 @@ class InvoiceAddress(models.Model):
             'internal_reference': self.internal_reference,
             'beneficiary': self.beneficiary,
             'transmission_type': self.transmission_type,
-            **self.transmission_info,
+            **(self.transmission_info or {}),
         })
         return d
 
diff --git a/src/pretix/base/services/mail.py b/src/pretix/base/services/mail.py
index 4448e28aa..5e6a159ee 100644
--- a/src/pretix/base/services/mail.py
+++ b/src/pretix/base/services/mail.py
@@ -665,7 +665,7 @@ def mail_send_task(self, *args, to: List[str], subject: str, body: str, html: st
                         (i.invoice_to_transmission_info or {}).get("transmission_email_address") or i.order.email,
                     ]
                     try:
-                        expected_recipients.append(order.invoice_address.transmission_info.get("transmission_email_address") or i.order.email)
+                        expected_recipients.append((order.invoice_address.transmission_info or {}).get("transmission_email_address") or i.order.email)
                     except InvoiceAddress.DoesNotExist:
                         pass
                     if not any(t in expected_recipients for t in to):
diff --git a/src/pretix/presale/checkoutflow.py b/src/pretix/presale/checkoutflow.py
index f1c965124..29304b0cf 100644
--- a/src/pretix/presale/checkoutflow.py
+++ b/src/pretix/presale/checkoutflow.py
@@ -1144,7 +1144,7 @@ class QuestionsStep(QuestionsViewMixin, CartMixin, TemplateFlowStep):
                         "_state_for_address": a.state_for_address,
                         "_name": a.name,
                         "is_business": "business" if a.is_business else "individual",
-                        **a.transmission_info,
+                        **(a.transmission_info or {}),
                     }
                     if a.name_parts:
                         name_parts = a.name_parts