Description of problem:
I changed to a profile which uses SSH where the remote computer could not be reached. Then I switched to another profile which is a local HDD. Then some background service has crashed and the GUI could not receive any more data.

Version-Release number of selected component:
backintime-qt4-1.1.24-1.fc27

Additional info:
reporter:       libreport-2.9.3
cmdline:        python3 /usr/share/backintime/qt4/app.py
crash_function: remove_symlink
exception_type: FileNotFoundError
executable:     /usr/share/backintime/qt4/app.py
kernel:         4.15.17-300.fc27.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
mount.py:451:remove_symlink:FileNotFoundError: [Errno 2] No such file or directory: '/home/mu/.local/share/backintime/mnt/6_17518'

Traceback (most recent call last):
  File "/usr/share/backintime/qt4/app.py", line 558, in on_profile_changed
    self.remount(profile_id, old_profile_id)
  File "/usr/share/backintime/qt4/app.py", line 585, in remount
    hash_id = mnt.remount(new_profile_id)
  File "/usr/share/backintime/common/mount.py", line 144, in remount
    self.umount(hash_id = hash_id, plugins = False)
  File "/usr/share/backintime/common/mount.py", line 114, in umount
    tools.umount()
  File "/usr/share/backintime/common/mount.py", line 249, in umount
    self.remove_symlink()
  File "/usr/share/backintime/common/mount.py", line 451, in remove_symlink
    os.remove(self.config.get_snapshots_path(profile_id = profile_id, mode = self.mode, tmp_mount = tmp_mount))
FileNotFoundError: [Errno 2] No such file or directory: '/home/mu/.local/share/backintime/mnt/6_17518'

Local variables in innermost frame:
tmp_mount: False
profile_id: '6'
self: <sshtools.SSH object at 0x7f9969e58518>