Invalid identifier (TZInfo::InvalidTimezoneIdentifier) error after upgrade to 2.0.3

[Manuel Bustillo Alonso]

I am experiencing an error after updating the clockwork gem from 2.0.2 to 2.0.3:

app/vendor/bundle/ruby/2.5.0/gems/tzinfo-1.2.5/lib/tzinfo/zoneinfo_data_source.rb:208:in `load_timezone_info': Invalid identifier (TZInfo::InvalidTimezoneIdentifier)
	from /app/vendor/bundle/ruby/2.5.0/gems/tzinfo-1.2.5/lib/tzinfo/timezone.rb:92:in `get'
	from /app/vendor/bundle/ruby/2.5.0/gems/clockwork-2.0.3/lib/clockwork/event.rb:20:in `convert_timezone'
	from /app/vendor/bundle/ruby/2.5.0/gems/clockwork-2.0.3/lib/clockwork/event.rb:24:in `run_now?'
	from /app/vendor/bundle/ruby/2.5.0/gems/clockwork-2.0.3/lib/clockwork/manager.rb:163:in `block in events_to_run'
	from /app/vendor/bundle/ruby/2.5.0/gems/clockwork-2.0.3/lib/clockwork/manager.rb:163:in `select'
	from /app/vendor/bundle/ruby/2.5.0/gems/clockwork-2.0.3/lib/clockwork/manager.rb:163:in `events_to_run'
	from /app/vendor/bundle/ruby/2.5.0/gems/clockwork-2.0.3/lib/clockwork/manager.rb:133:in `tick'
	from /app/vendor/bundle/ruby/2.5.0/gems/clockwork-2.0.3/lib/clockwork/manager.rb:123:in `block (2 levels) in run_tick_loop'
	from /app/vendor/bundle/ruby/2.5.0/gems/clockwork-2.0.3/lib/clockwork/manager.rb:121:in `synchronize'
	from /app/vendor/bundle/ruby/2.5.0/gems/clockwork-2.0.3/lib/clockwork/manager.rb:121:in `block in run_tick_loop'

Tested with Ruby versions: 2.5.0 and 2.5.1

I can reproduce this locally (Ubuntu 16.04) running bundle exec clockwork config/clock.rb. This does not happen with version 2.0.2