Vagrant cli bricked out of the blue

Things were working fine until one day the below error happened.
Not sure how to debug. ( relatively new to vagrant)

➜  scratch vagrant -v
Vagrant 2.2.19
➜  scratch vagrant global-status
/usr/lib/ruby/3.0.0/json/common.rb:216:in `parse': 809: unexpected token at '' (JSON::ParserError)
	from /usr/lib/ruby/3.0.0/json/common.rb:216:in `parse'
	from /usr/share/rubygems-integration/all/gems/vagrant-2.2.19/lib/vagrant/vagrantfile.rb:187:in `machine_config'
	from /usr/share/rubygems-integration/all/gems/vagrant-2.2.19/lib/vagrant/environment.rb:959:in `block in find_configured_plugins'
	from /usr/share/rubygems-integration/all/gems/vagrant-2.2.19/lib/vagrant/environment.rb:957:in `each'
	from /usr/share/rubygems-integration/all/gems/vagrant-2.2.19/lib/vagrant/environment.rb:957:in `find_configured_plugins'
	from /usr/share/rubygems-integration/all/gems/vagrant-2.2.19/lib/vagrant/environment.rb:984:in `process_configured_plugins'
	from /usr/share/rubygems-integration/all/gems/vagrant-2.2.19/lib/vagrant/environment.rb:178:in `initialize'
	from /usr/share/rubygems-integration/all/gems/vagrant-2.2.19/bin/vagrant:194:in `new'
	from /usr/share/rubygems-integration/all/gems/vagrant-2.2.19/bin/vagrant:194:in `<top (required)>'
	from /usr/bin/vagrant:25:in `load'
	from /usr/bin/vagrant:25:in `<main>'
➜  scratch