From c913e448032a5130bd5805556a84911c9b56f4bc Mon Sep 17 00:00:00 2001
From: Raphael Michel <mail@raphaelmichel.de>
Date: Mon, 29 Aug 2016 21:24:59 +0200
Subject: [PATCH] Fixed a problem with custom prices introduced in 4fa631a

---
 src/pretix/presale/views/cart.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/pretix/presale/views/cart.py b/src/pretix/presale/views/cart.py
index cfb33427e7..fc992787e4 100644
--- a/src/pretix/presale/views/cart.py
+++ b/src/pretix/presale/views/cart.py
@@ -57,6 +57,9 @@ class CartActionMixin:
             else:
                 voucher = None
 
+            if not key.startswith('item_') and not key.startswith('variation_'):
+                continue
+
             try:
                 amount = int(value)
             except ValueError: