# `MishkaCmsCore.Runtime.PageBuilder.Strict.Violation`
[🔗](https://github.com/mishka-group/mishka_cms_core/blob/v0.0.1/lib/mishka_cms_core/runtime/page_builder/__strict/violation.ex#L5)

Raised when the editor finds itself in a state that should not be reachable.

Only ever raised in development and test — see `MishkaCmsCore.Runtime.PageBuilder.Strict`, which
compiles every check out of a release. Meeting one is a bug in the editor, not a bad document and
not something a reader did.

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*Consult [api-reference.md](api-reference.md) for complete listing*