CHANGE THIS in associations.rb

def select_limited_ids_list(options, join_dependency)

      pk = columns_hash[primary_key]

      connection.select_all(
        construct_finder_sql_for_association_limiting(options, join_dependency),
        "#{name} Load IDs For Limited Eager Loading"
      ).collect { |row| connection.quote(row[primary_key], pk) }.join(", ")
    end

TO THIS

def select_limited_ids_list(options, join_dependency)

      pk = columns_hash[primary_key]

      connection.select_all(
        construct_finder_sql_for_association_limiting(options, join_dependency),
        "#{name} Load IDs For Limited Eager Loading"
      ).collect { |row|
        value_to_quote = row[primary_key]
        if value_to_quote == nil
          value_to_quote = row[table_name + '.' + primary_key]
        end
        connection.quote(value_to_quote, pk)
      }.join(", ")
    end