fastlane: undefined method `[]' for # (NoMethodError)

New Regression Checklist

• Updated fastlane to the latest version
• I read the Contribution Guidelines
• I read docs.fastlane.tools
• I searched for existing GitHub issues

Regression Information

• Breaking version: 2.125.0
• Last working version: not sure

Regression Description

latest_testflight_build_number has stopped working. Throws this:

/Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/actions/app_store_build_number.rb:47:in `get_build_number': [!] undefined method `[]' for #<Spaceship::ConnectAPI::PreReleaseVersion:0x00007fb398a54670> (NoMethodError)
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/actions/app_store_build_number.rb:11:in `run'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/actions/latest_testflight_build_number.rb:11:in `run'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/runner.rb:256:in `block (2 levels) in execute_action'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/actions/actions_helper.rb:50:in `execute_action'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/runner.rb:235:in `block in execute_action'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/runner.rb:227:in `chdir'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/runner.rb:227:in `execute_action'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/runner.rb:157:in `trigger_action_by_name'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/fast_file.rb:154:in `method_missing'
	from Fastfile:49:in `block (2 levels) in parsing_binding'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/lane.rb:33:in `call'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/runner.rb:49:in `block in execute'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/runner.rb:45:in `chdir'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/runner.rb:45:in `execute'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/lane_manager.rb:56:in `cruise_lane'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/command_line_handler.rb:36:in `handle'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/commands_generator.rb:108:in `block (2 levels) in run'
	from /Library/Ruby/Gems/2.3.0/gems/commander-fastlane-4.4.6/lib/commander/command.rb:178:in `call'
	from /Library/Ruby/Gems/2.3.0/gems/commander-fastlane-4.4.6/lib/commander/command.rb:153:in `run'
	from /Library/Ruby/Gems/2.3.0/gems/commander-fastlane-4.4.6/lib/commander/runner.rb:476:in `run_active_command'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane_core/lib/fastlane_core/ui/fastlane_runner.rb:76:in `run!'
	from /Library/Ruby/Gems/2.3.0/gems/commander-fastlane-4.4.6/lib/commander/delegates.rb:15:in `run!'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/commands_generator.rb:333:in `run'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/commands_generator.rb:41:in `start'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/fastlane/lib/fastlane/cli_tools_distributor.rb:119:in `take_off'
	from /Library/Ruby/Gems/2.3.0/gems/fastlane-2.125.0/bin/fastlane:23:in `<top (required)>'
	from /usr/local/bin/fastlane:22:in `load'
	from /usr/local/bin/fastlane:22:in `<main>'
Exited with code 1