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Cannot Read Properties Of Undefined

Meaning:

  • often not the primary problem
  • usually indicates a prior GraphQL request failed and the sample kept going

Why this happens:

  • the sample logs GraphQL errors but does not rethrow them

What to do:

  1. scroll up and find the earlier GraphQL error: line
  2. fix that backend or auth issue first
  3. rerun the sample

Add other issues here as they come up​

When you add a new error page:

  1. use the exact error string in the title and dropdown label
  2. explain what it means in plain language
  3. list the most likely fixes