Weirds artboards appears
### Describe the bug

After commits some pull request, I found a lot of blank artboards with a name similar to `E719C5E6-9DFB-4E21-8EC9-239939AC5C7B`

### Version & OS

0.3.29
(but I saw this issue in versions before)

### Steps to reproduce the behavior

I don't know how to reproduce, I know that it is common when I merge pull requests.


### Screenshots

![Screenshot 2020-04-03 at 13 55 57](https://user-images.githubusercontent.com/6722153/78358312-470f4400-75b3-11ea-8121-8188df395fbd.png)


(sorry Mathieu for creating a lot of issues 🙏)
