`render_header': undefined method `header' for nil:NilClass (NoMethodError)

[JustinPealing]

On Ubuntu 19.04, having done gem install ecl I get the following error running ecl a second time (after the config file has been created)

Traceback (most recent call last):
	6: from /home/justin/.rbenv/versions/2.5.0/bin/ecl:23:in `<main>'
	5: from /home/justin/.rbenv/versions/2.5.0/bin/ecl:23:in `load'
	4: from /home/justin/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/ecl-1.2.1/exe/ecl:4:in `<top (required)>'
	3: from /home/justin/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/ecl-1.2.1/lib/eclair/console.rb:16:in `init'
	2: from /home/justin/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/ecl-1.2.1/lib/eclair/grid.rb:60:in `start'
	1: from /home/justin/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/ecl-1.2.1/lib/eclair/grid.rb:108:in `render_all'
/home/justin/.rbenv/versions/2.5.0/lib/ruby/gems/2.5.0/gems/ecl-1.2.1/lib/eclair/grid.rb:23:in `render_header': undefined method `header' for nil:NilClass (NoMethodError)

ruby version:

ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-linux]