Running a pipeline manually returns error 500

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https://sentry.gitlab.net/gitlab/gitlabcom/issues/1561103/?referrer=gitlab_plugin

TypeError: no implicit conversion of nil into String
  gitlab/ci/pipeline/expression/lexer.rb:28:in `initialize'
    @scanner = StringScanner.new(statement)
  gitlab/ci/pipeline/expression/lexer.rb:28:in `new'
    @scanner = StringScanner.new(statement)
  gitlab/ci/pipeline/expression/lexer.rb:28:in `initialize'
    @scanner = StringScanner.new(statement)
  gitlab/ci/pipeline/expression/statement.rb:11:in `new'
    @lexer = Expression::Lexer.new(statement)
  gitlab/ci/pipeline/expression/statement.rb:11:in `initialize'
    @lexer = Expression::Lexer.new(statement)
...
(170 additional frame(s) were not displayed)

TypeError: no implicit conversion of nil into String

Related Support Tickets (internal)

1. https://gitlab.zendesk.com/agent/tickets/155087