Error running the example code

[ragesoss]

I tried running the example code from the README, but I'm stuck with an unexpected error. I'm running this on Debian 9, with Ruby 2.6.1.

I tried this code:

# maptest.rb
require 'ruby_vor'

points = [
  RubyVor::Point.new(120, 290),
  RubyVor::Point.new(110, 120),
  RubyVor::Point.new(160, 90.2),
  RubyVor::Point.new(3.14159265, 3.14159265)
]

# Compute the diagram & triangulation
comp = RubyVor::VDDT::Computation.from_points(points)

puts "The nearest-neighbor graph:"
pp comp.nn_graph

puts "\nThe minimum-spanning tree:"
pp comp.minimum_spanning_tree

# Just the triangulation
RubyVor::Visualizer.make_svg(comp, :name => 'tri.svg')

# Just the MST
RubyVor::Visualizer.make_svg(comp, :name => 'mst.svg', :triangulation => false, :mst => true)

# Voronoi diagram and the triangulation
RubyVor::Visualizer.make_svg(comp, :name => 'dia.svg', :voronoi_diagram => true)

It results in this output:

The nearest-neighbor graph:
[[2, 1, 3], [3, 2, 0], [3, 1, 0], [1, 2, 0]]

The minimum-spanning tree:
Traceback (most recent call last):
        3: from maptest.rb:17:in `<main>'
        2: from maptest.rb:17:in `minimum_spanning_tree'
        1: from /home/sage/.rbenv/versions/2.6.1/lib/ruby/gems/2.6.0/gems/rubyvor-0.1.4/lib/ruby_vor/priority_queue.rb:60:in `push'
/home/sage/.rbenv/versions/2.6.1/lib/ruby/gems/2.6.0/gems/rubyvor-0.1.4/lib/ruby_vor/priority_queue.rb:60:in `percolate_up': no implicit conversion to float from nil (TypeError)