Proc object without a block

[codebykevin]

Any attempt to run a simple demo script with this command on Ruby 3.0 returns this error:

C:/Ruby30-x64/lib/ruby/gems/3.0.0/gems/ffi-tk-2018.02.20/lib/ffi-tk/thread_sender.rb:23:in new': tried to create Proc object without a block (ArgumentError)`

I was hoping to test this gem with Tk 8.7 as the ruby-tk gem does not support 8.7.