diff --git a/src/pretix/presale/forms/waitinglist.py b/src/pretix/presale/forms/waitinglist.py
index fa25da631..1343c1fbc 100644
--- a/src/pretix/presale/forms/waitinglist.py
+++ b/src/pretix/presale/forms/waitinglist.py
@@ -122,7 +122,7 @@ class WaitingListForm(forms.ModelForm):
             else:
                 self.instance.variation = None
 
-        except ObjectDoesNotExist:
+        except (ObjectDoesNotExist, ValueError):
             raise ValidationError(_("Invalid product selected."))
 
         data = super().clean()