Files: App crashes when go to 'Preferences' settings

[xmha97]

Describe the bug
This app crashes when I go to 'Preferences' settings.

To Reproduce
Steps to reproduce the behavior:

1. Click on 'Settings'
2. Click on 'Preferences'
3. The app crashes and closed.

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. Windows 10 1909 18363.959]
• App version: [v0.12.0.0]

Additional context
Add any other context about the problem here. For instance, are you building from source or using a precompiled build/snapshot?

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[yaichenbaum]

Merging with #1480.