From 347337e76f9828961000c87d7bee25410d85ecd0 Mon Sep 17 00:00:00 2001
From: Raphael Michel <michel@pretix.eu>
Date: Mon, 9 Mar 2026 13:52:11 +0100
Subject: [PATCH] Invoice generation: Add way for renderers to signal they are
 not ready (#5905)

---
 src/pretix/base/invoicing/pdf.py     | 4 ++++
 src/pretix/base/services/invoices.py | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/pretix/base/invoicing/pdf.py b/src/pretix/base/invoicing/pdf.py
index 2eed2f8e3..21765a629 100644
--- a/src/pretix/base/invoicing/pdf.py
+++ b/src/pretix/base/invoicing/pdf.py
@@ -148,6 +148,10 @@ class NumberedCanvas(Canvas):
         self.restoreState()
 
 
+class InvoiceNotReadyException(Exception):
+    pass
+
+
 class BaseInvoiceRenderer:
     """
     This is the base class for all invoice renderers.
diff --git a/src/pretix/base/services/invoices.py b/src/pretix/base/services/invoices.py
index d76c48c99..deadc4d2f 100644
--- a/src/pretix/base/services/invoices.py
+++ b/src/pretix/base/services/invoices.py
@@ -51,6 +51,7 @@ from django_scopes import scope, scopes_disabled
 from i18nfield.strings import LazyI18nString
 
 from pretix.base.i18n import language
+from pretix.base.invoicing.pdf import InvoiceNotReadyException
 from pretix.base.invoicing.transmission import (
     get_transmission_types, transmission_providers,
 )
@@ -504,7 +505,7 @@ def generate_invoice(order: Order, trigger_pdf=True):
     return invoice
 
 
-@app.task(base=TransactionAwareTask)
+@app.task(base=TransactionAwareTask, throws=(InvoiceNotReadyException,))
 def invoice_pdf_task(invoice: int):
     with scopes_disabled():
         i = Invoice.objects.get(pk=invoice)