diff --git a/src/pretix/static/pretixpresale/js/ui/main.js b/src/pretix/static/pretixpresale/js/ui/main.js
index 7ff44da4a..ca333b33e 100644
--- a/src/pretix/static/pretixpresale/js/ui/main.js
+++ b/src/pretix/static/pretixpresale/js/ui/main.js
@@ -197,7 +197,11 @@ $(function () {
                 }
             });
         }
-        $("#btn-add-to-cart").prop("disabled", !is_enabled);
+        if (!is_enabled) {
+            $("#btn-add-to-cart").prop("disabled", !is_enabled).popover({'content': gettext("Please enter a quantity for one of the ticket types."), 'placement': 'top', 'trigger': 'hover focus'});
+        } else {
+            $("#btn-add-to-cart").prop("disabled", false).popover("destroy")
+        }
     };
     update_cart_form();
     $(".product-row input[type=checkbox], .variations input[type=checkbox], .product-row input[type=radio], .variations input[type=radio], .input-item-count").on("change mouseup keyup", update_cart_form);