---
title: "New Flow Errors on Unknown Property Access in Conditionals"
short-title: "Unknown Props in Conditionals"
authors: [gabe-levi]
medium-link: "https://medium.com/flow-type/new-flow-errors-on-unknown-property-access-in-conditionals-461da66ea10"
---

:::info[Historical]
This post announced errors on unknown property access in conditionals when it was introduced. For current syntax and behavior, see the [Refinements](/en/docs/lang/refinements) documentation.
:::

TL;DR: Starting in 0.68.0, Flow will now error when you access unknown
properties in conditionals.

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