# matplotlib__matplotlib-25442

> The fix needs to handle the case where ref_artist.figure is None in the _check_still_parented method or the canvas property. Let me provide the correct pat

- Source: https://doutorai.pt/en/components/skills__matplotlib-matplotlib-25442
- Type: Skills
- Category: AI research
- Downloads: 0
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An open-source community component, curated and adapted by Doutor AI.

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A **skill** that teaches Claude Code to do ai research tasks well. It is packaged knowledge the model uses whenever it is relevant.

1. Install the skill (command above).
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## Install (Claude Code)

```bash
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```

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## Content

```
Based on my analysis of the bug report and the existing patch file, I understand the issue:

1. The bug occurs in `DraggableBase` class in `lib/matplotlib/offsetbox.py`
2. When `disconnect()` is called, it accesses `self.ref_artist.figure.canvas` through the `canvas` property
3. The issue is that `ref_artist.figure` can be `None` at this point, causing the `AttributeError`

Looking at the traceback more carefully:
- `_check_still_parented()` checks if the widget is still parented
- If not parented, it calls `disconnect()`
- `disconnect()` tries to access `self.canvas` which uses the property `

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```

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Content by Doutor AI (https://doutorai.pt/en). When quoting, please cite the source: https://doutorai.pt/en/components/skills__matplotlib-matplotlib-25442