---
title: "12.17.2"
url: "https://www.cypress.io/releases/12-17-2"
description: "Bugfixes: Fixed an issue where commands would fail with the error must only be invoked from the spec file or support file if their arguments were mutated…"
---

# 12.17.2

ReleasedReleased on July 19, 2023

**Bugfixes:**

-   Fixed an issue where commands would fail with the error `must only be invoked from the spec file or support file` if their arguments were mutated. Fixes [#27200](https://github.com/cypress-io/cypress/issues/27200).
    
-   Fixed an issue where `cy.writeFile()` would erroneously fail with the error `cy.writeFile() must only be invoked from the spec file or support file`. Fixes [#27097](https://github.com/cypress-io/cypress/issues/27097).
    
-   Fixed an issue where web workers could not be created within a spec. Fixes [#27298](https://github.com/cypress-io/cypress/issues/27298).