[BUG] Crash when backing up data to nextcloud.

[kerbless]

Describe the bug
The app crashes when selecting the folder to back up files to if it's a nextcloud folder. This does not happen with regular folders.

To Reproduce

1. Go to backup and restore
2. Click backup
3. Select from the left menu a network location (I only tried nextcloud)
4. Select a folder
5. Click backup
6. App crashes

Expected behavior
Backing up normally.

Device (please complete the following information):

• Device model: Mi 9T Pro
• Android version: Android 13 (LineageOS 20)
• App version: 1.8.5
• Installed from: FDroid