[🐛 BUG] - Child Windows Error

It's difficult to explain, but when open three child windows, close the last window, and re-open it gives the error (i´m including a video for a better explanaiton)

Steps to reproduce the behavior:
1. First you have to log-in in two accounts
2. On the secondary account (the account you added after the first log-in) create a .doc (Google Docs) document.
3. Close everything.
4. Open again G Desktop Suite
5. Select the second account on circle of the first account profile photo (this will open another window with the second account).
6. Open the document created before (this will open another window with the document).
7. Close this last window (the document)
8. Re-open the same document.
9. See the error

Screenshot

Video
https://yadi.sk/i/8wj-l6EC4SwVXw

- Version 0.3.1
- OS: Windows 10