ics renderer: NoMethodError: undefined method `name' for nil:NilClass

[sentry]

Sentry Issue: SNAPCON-2B

NoMethodError: undefined method `name' for nil:NilClass
  app/helpers/conference_helper.rb:59:in `block (2 levels) in icalendar_proposals'
    "Track: #{proposal.track.name}"
  app/helpers/conference_helper.rb:38:in `block in icalendar_proposals'
    calendar.event do |e|
  app/helpers/conference_helper.rb:37:in `each'
    proposals.each do |proposal|
  app/helpers/conference_helper.rb:37:in `icalendar_proposals'
    proposals.each do |proposal|
  app/controllers/schedules_controller.rb:27:in `block (2 levels) in show'
    cal = icalendar_proposals(cal, event_schedules.map(&:event), @conference)
...
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