Cannot execute 'brew cask install vagrant'

[planerist]

brew cask install vagrant
==> Downloading https://dl.bintray.com/mitchellh/vagrant/vagrant_1.6.5.dmg
Already downloaded: /Library/Caches/Homebrew/vagrant-1.6.5.dmg
Error: no implicit conversion of nil into String
Please report this bug:
https://github.com/caskroom/homebrew-cask/issues
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/digest.rb:44:in initialize' /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/digest.rb:44:inopen'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/digest.rb:44:in file' /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/digest.rb:29:infile'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/download.rb:40:in block in _check_sums' /usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/download.rb:38:ineach'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/download.rb:38:in _check_sums' /usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/download.rb:31:inperform'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/installer.rb:74:in download' /usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/installer.rb:51:ininstall'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/cli/install.rb:20:in block in install_casks' /usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/cli/install.rb:17:ineach'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/cli/install.rb:17:in install_casks' /usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/cli/install.rb:6:inrun'
/usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/cli.rb:81:in run_command' /usr/local/Cellar/brew-cask/0.49.0/rubylib/cask/cli.rb:121:inprocess'
/usr/local/bin/brew-cask.rb:42:in <top (required)>' /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:inrequire'
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in require' /usr/local/Library/brew.rb:59:inrequire?'
/usr/local/Library/brew.rb:142:in `

'

[L2G]

This may be related to #7946.

[vitorgalvao]

Seems like it. Closing in favor of that issue.