Invalid index: The given key does not identify an element Terraform Origin: Platform & cloud Last updated 5 Nov 2026

Terraform: Error: Invalid index — The given key does not identify an element in this collection value

You indexed a map/list/set with a key or position that doesn't exist.

Exact message you may see Error: Invalid indexThe given key does not identify an element in this collection valueError: Invalid index: The given key does not identify an element in this collection value: the collection has no elementsError: Invalid index This value does not have any indicesError: Invalid index: the given key does not identify an element
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Seen on: Terraform

Meaning

Typical: var.map["key"] missing, resource.x[0] when count = 0, aws_instance.web[*].id[0] on empty, or for_each keys changed. Use lookup(), try(), one(), or check length(). With count = 0 resources, use one(resource[*].id) to get null/the single value.

Common causes

  • Map key missing
  • Empty list indexed [0]
  • Resource with count = 0 referenced by index
  • for_each key not present
  • Output of conditional resource

⚡ Quick fix

  1. one(aws_x.this[*].id) for 0-or-1 resources
  2. lookup(map, key, default)
  3. try(local.list[0], null)

Detailed fix by platform

Terraform

  1. output "id" { value = one(aws_instance.optional[*].id) }

How to diagnose

  1. Collection — Empty?
  2. Key — Exists?
  3. Pattern — one()/try()?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Platform & cloud. Errors that are often confused with or caused by this one (click to open):

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