touchpad-indicator crashes on Linux Mint 18.3 Sylvia

Stack trace when starting touchpad-indicator from command line.

<gettext.GNUTranslations object at 0x7f7e448da2e8>
No LSB modules are available.
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Distributor: LinuxMint
Description: Linux Mint 18.3 Sylvia
Release: 18.3
Codename: sylvia
Architecture: x86_64
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Touchpad-Indicator version: 2.2.0-0extras19.04.1ubuntu1
device device /dev/input/event21, name "DELL07E6:00 06CB:76AF Touchpad", phys "i2c-DELL07E6:00"
Traceback (most recent call last):
  File "/usr/bin/touchpad-indicator", line 36, in <module>
    main()
  File "/usr/share/touchpad-indicator/touchpadindicator.py", line 723, in main
    TouchpadIndicator()
  File "/usr/share/touchpad-indicator/touchpadindicator.py", line 104, in __init__
    self.touchpad = Touchpad()
  File "/usr/share/touchpad-indicator/touchpad.py", line 77, in __init__
    self.touchpads = get_touchpads()
  File "/usr/share/touchpad-indicator/touchpad.py", line 69, in get_touchpads
    evDevDevice = evdev.InputDevice(device)
  File "/usr/lib/python3/dist-packages/evdev/device.py", line 93, in __init__
    self.fd = os.open(dev, os.O_RDWR | os.O_NONBLOCK)
TypeError: open: illegal type for path parameter