diff --git a/src/pretix/base/services/cart.py b/src/pretix/base/services/cart.py
index 58c44334e5..b54bb56114 100644
--- a/src/pretix/base/services/cart.py
+++ b/src/pretix/base/services/cart.py
@@ -773,6 +773,9 @@ class CartManager:
 
         err = None
         for item, count in items.items():
+            if count == 0:
+                continue
+
             if item.max_per_order and count > item.max_per_order:
                 raise CartError(
                     _(error_messages['max_items_per_product']) % {