This release solves a bug introduced while backporting [#6464](https://github.com/doctrine/doctrine2/pull/6464) and [#6475](https://github.com/doctrine/doctrine2/pull/6475). Specifically, a dangling undefined variable remained in the code, causing some `SqlWalker` functionality to misbehave. The undefined variable wasn't noticed due to it being placed in an `empty()` expression. Total issues resolved: **1** - [6621: Fixed usage of undefined variable in `empty()` expression in `SqlWalker`](https://github.com/doctrine/doctrine2/pull/6621) thanks to @Powerhamster