diff --git a/activerecord/lib/active_record/relation/predicate_builder/array_handler.rb b/activerecord/lib/active_record/relation/predicate_builder/array_handler.rb

index fb08326..d4e74eb 100644

--- a/activerecord/lib/active_record/relation/predicate_builder/array_handler.rb

+++ b/activerecord/lib/active_record/relation/predicate_builder/array_handler.rb

@@ -14,7 +14,8 @@ def call(attribute, value)

             it for 'IN' conditions.

           MSG

-          values = values.flatten

+          flat_values = values.flatten

+          values = flat_values unless flat_values.include?(nil)

         end

         return attribute.in([]) if values.empty? && nils.empty?