How do I get rid of an error when Chef-client finishes?

Chef Infra (archive)
1

My Chef recipe does what I want it to do except there is an error when Chef-client completes.

Should I ignore the error or be alarmed? I would like to get rid of the error, but it will not bother me that much. My Chef recipe installs Java. Here is the error and related output:

================================================================================
Error executing action create on resource ‘ruby_block[update-java-alternatives]’
================================================================================

TypeError
---------
no implicit conversion of nil into String

Cookbook Trace:
---------------
/var/chef/cache/cookbooks/java/recipes/openjdk.rb:63:in `block (2 levels) in from_file'

Resource Declaration:
---------------------
# In /var/chef/cache/cookbooks/java/recipes/openjdk.rb

 43:   ruby_block "update-java-alternatives" do
 44:     block do
 45:       if platform?("ubuntu", "debian") and version == 8
 46:         run_context = Chef::RunContext.new(node, {})
 47:         r = Chef::Resource::Execute.new("update-java-alternatives", run_context)
 48:         r.command "update-java-alternatives -s java-8-openjdk"
 49:         r.returns [0,2]
 50:         r.run_action(:create)
 51:       else
 52:         # have to do this on ubuntu for version 7 because Ubuntu does
 53:         # not currently set jdk 7 as the default jvm on installation
 54:         require "fileutils"
 55:         arch = node['kernel']['machine'] =~ /x86_64/ ? "x86_64" : "i386"
 56:         Chef::Log.debug("glob is #{java_home_parent}/java*#{version}*openjdk*")
 57:         jdk_home = Dir.glob("#{java_home_parent}/java*#{version}*openjdk{,[-\.]#{arch}}")[0]
 58:         Chef::Log.debug("jdk_home is #{jdk_home}")
 59:         # delete the symlink if it already exists
 60:         if File.exists? java_home
 61:           FileUtils.rm_f java_home
 62:         end
 63:         FileUtils.ln_sf jdk_home, java_home
 64:
 65:         cmd = Chef::ShellOut.new(
 66:           %Q[ update-alternatives --install /usr/bin/java java #{java_home}/bin/java 1;
 67:              update-alternatives --set java #{java_home}/bin/java  ]
 68:           ).run_command
 69:         unless cmd.exitstatus == 0 or  cmd.exitstatus == 2
 70:           Chef::Application.fatal!("Failed to update-alternatives for openjdk!")
 71:         end
 72:       end
 73:     end

Compiled Resource:
------------------
# Declared in /var/chef/cache/cookbooks/java/recipes/openjdk.rb:43:in `from_file'

ruby_block("update-java-alternatives") do
  action [:nothing]
  default_guard_interpreter :default
  block_name "update-java-alternatives"
  declared_type :ruby_block
  cookbook_name "java"
  recipe_name "openjdk"
  block #<Proc:0x0000000003112c10@/var/chef/cache/cookbooks/java/recipes/openjdk.rb:44>
end

System Info:
------------
chef_version=13.6.4
platform=ubuntu
platform_version=16.04
ruby=ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-linux]
program_name=chef-client worker: ppid=26832;start=03:17:15;
executable=/opt/chef/bin/chef-client