diff --git a/lib/graphiti/serializer.rb b/lib/graphiti/serializer.rb
index 47ebd7bd..ae581ba3 100644
--- a/lib/graphiti/serializer.rb
+++ b/lib/graphiti/serializer.rb
@@ -13,6 +13,8 @@ class Serializer < JSONAPI::Serializable::Resource
     class_attribute :attributes_applied_via_resource
     class_attribute :extra_attributes_applied_via_resource
     class_attribute :relationship_condition_blocks
+    class_attribute :field_condition_blocks
+    self.field_condition_blocks ||= {}
     self.attributes_applied_via_resource = []
     self.extra_attributes_applied_via_resource = []
     # See #requested_relationships