Terraform CLI
Terraform could not convert the value to number
Error: Invalid function argument
Terraform could not convert the supplied value to a number because tonumber only accepts numbers, null, or strings containing decimal numeric text.
Error AtlasError Documentation and ResolutionObserved message
Error: Invalid function argument
Why it happens
- The expression passes a non-numeric string such as no or abc to tonumber.
- The function receives a collection or incompatible type instead of a number-like value.
- Input normalization assumes Terraform can parse values that are not decimal numbers.
How to fix it
- Check the exact value passed into tonumber and ensure it is numeric text or an existing number.
- Normalize input variables earlier if they can arrive in multiple formats.
- Avoid using tonumber on values that may contain non-numeric text without prior validation.
Official reference
tonumber functionRelated errors
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