diff --git a/app/assets/javascripts/darkswarm/directives/shop_variant.js.coffee b/app/assets/javascripts/darkswarm/directives/shop_variant.js.coffee
index d679e6c3f0..84615e3125 100644
--- a/app/assets/javascripts/darkswarm/directives/shop_variant.js.coffee
+++ b/app/assets/javascripts/darkswarm/directives/shop_variant.js.coffee
@@ -5,5 +5,9 @@ Darkswarm.directive "shopVariant", ->
   scope:
     variant: '='
   controller: ($scope, Cart) ->
-    $scope.$watchGroup ['variant.line_item.quantity', 'variant.line_item.max_quantity'], ->
+    $scope.$watchGroup [
+      'variant.line_item.quantity',
+      'variant.line_item.max_quantity'
+    ], (new_value, old_value) ->
+      return if old_value[0] == null && new_value[0] == null
       Cart.adjust($scope.variant.line_item)
diff --git a/spec/javascripts/unit/darkswarm/services/cart_spec.js.coffee b/spec/javascripts/unit/darkswarm/services/cart_spec.js.coffee
index f8d124c110..0b9c398a85 100644
--- a/spec/javascripts/unit/darkswarm/services/cart_spec.js.coffee
+++ b/spec/javascripts/unit/darkswarm/services/cart_spec.js.coffee
@@ -45,6 +45,13 @@ describe 'Cart service', ->
     Cart.adjust(order.line_items[0])
     expect(Cart.line_items.length).toEqual 0
 
+  it "does not add an item in the cart without quantity", ->
+    Cart.line_items = []
+
+    spyOn(Cart, 'orderChanged')
+    order.line_items[0].max_quantity = 0
+    expect(Cart.orderChanged).not.toHaveBeenCalled()
+
   it "sums the quantity of each line item for cart total", ->
     order.line_items[0].quantity = 2
     expect(Cart.total_item_count()).toEqual 2