No resource, method, or local variable named 'ha' for recipe "default"

[nogweii]

================================================================================
  Recipe Compile Error in /var/chef/cache/cookbooks/tinc/recipes/default.rb
  ================================================================================

  NameError
  ---------
  No resource, method, or local variable named `ha' for `Chef::Recipe "default"'

  Cookbook Trace:
  ---------------
    /var/chef/cache/cookbooks/tinc/recipes/default.rb:17:in `hex_address_unique?'
    /var/chef/cache/cookbooks/tinc/recipes/default.rb:26:in `block in from_file'
    /var/chef/cache/cookbooks/tinc/recipes/default.rb:24:in `loop'
    /var/chef/cache/cookbooks/tinc/recipes/default.rb:24:in `from_file'

  Relevant File Content:
  ----------------------
  /var/chef/cache/cookbooks/tinc/recipes/default.rb:

   10:  def hex_address_unique?(hex_address)
   11:    return false if hex_address == '0000'
   12:    return false if hex_address == 'ffff'
   13:    if Chef::Config[:solo]
   14:      Chef::Log.warn('Running solo, cannot check address uniqueness')
   15:      return true
   16:    else
   17>>     return search(:node, "tinc_hex_address:#{ha}").empty?
   18:    end
   19:  end
   20:
   21:  unless node['tinc']['hex_address']
   22:    require 'digest/md5'
   23:    ha_base = node.name
   24:    loop do
   25:      ha = Digest::MD5.hexdigest(ha_base)[-4..-1]
   26:      if hex_address_unique?(ha)

Just as the title says, I think this was an instance of incorrect copy & paste. I expect it should be hex_address in this instance?