# `GSGlyph.undoManagerCheck`

*Instance Property*

The glyph’s undo manager when undo registration is enabled, or `nil` otherwise.

## Declaration

```swift
var undoManagerCheck: GSUndoManager? { get }
```

```objc
@property (nonatomic, readonly) GSUndoManager * undoManagerCheck;
```

```python
undoManagerCheck() -> GSUndoManager
```

## See Also

### Undo

- [`GSGlyph.undoManager`](/Core/GlyphsCore/GSGlyph/undoManager) — The undo manager associated with edits to the glyph.