reference to a variable 'i' that could not be looked up in the question file

Reproduction steps (done on apps-dev, through the playground at the moment)

(input any valid address and anything else for name, contact info, and SSN)
Check SSI for what you are receiving
Check only "I started working for an employer" on id: change type
Fill in the info for the job (anything)
On the "Do you have any other jobs to report?" question, select yes or no
On the next screen, press the back button to change your answer to the other jobs to report
You've arrived at the below error

Full error text:


History
Tried to run mandatory code at 0.00000s

id: order
mandatory: True
code: |
  letter_date
  intro_screen
  client.name.first
  client.phone_number
  client.ssn
  benefits_type
  set_changes
  if working or working_for_self:
    jobs.gather()
  # changes
  other_changes
  if not working and not working_for_self and (changes.true_values().number() < 1) and not other_changes:
    wrong_interview
  else:
    if benefits_type == 'ssi':
      #if changes.true_values().number() > 0:
      if changes['I moved']:
        #saw_change_choices     
        yes_moved
      if changes['I was in jail']: 
        yes_jail
        jail_range
      if changes['I was in the hospital']:  
        yes_hospital
        hopsital_range
      if changes['I was in a nursing home']: 
        yes_nursing
        nursing_range
      if changes['I was outside of the United States for more than 30 days in a row']: 
        yes_expat
        expat_range
      if changes['The number of people in my household changed']:
        change_details['The number of people in my household changed'].reasons
        household_change_date

      if changes['I received assistance to pay for rent or food']:
        change_details['I received assistance to pay for rent or food'].date

      if changes['I received money from a lawsuit or lottery winnings']: 
        change_details['I received money from a lawsuit or lottery winnings'].date 

      if changes['My immigration status changed']: 
        change_details['My immigration status changed'].date 

  changes_details
  ssa_office.name.text
  client.signature
  store_variables_snapshot(data={'zip':client.address.zip,
    'state':client.address.state,
    'change_type':change_type,
    'changes': changes.true_values(),
    'benefits_type':benefits_type,
    'date':today(),
    'ssa_office': str(ssa_office.address.on_one_line()),
    })
  download_form

Needed definition of jobs.there_is_another at 0.00007s
Tried to ask question at 0.00017s

id: job is there another
question: |
  So far you have told us about ${i+1} jobs.
subquestion: |
  Do you have any other jobs to report?
yesno: jobs.there_is_another

Needed definition of i at 0.00087s

nonprofittechy / docassemble-ssareportchangesletter

reference to a variable 'i' that could not be looked up in the question file #27