Starting qtile is fine but when i reload the config qtile freezes. I had to 
go to tty to restart.
There error is as follows 
```
2021-02-26 23:09:02,693 ERROR libqtile 
manager.py:get_interesting_pid():L598 Got an exception in getting the 
window pid
Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/libqtile/core/manager.py", line 
596, in get_interesting_pid
    return win.window.get_net_wm_pid()
  File "/usr/lib/python3.9/site-packages/libqtile/backend/x11/xcbq.py", 
line 610, in get_net_wm_pid
    r = self.get_property("_NET_WM_PID", unpack=int)
  File "/usr/lib/python3.9/site-packages/libqtile/backend/x11/xcbq.py", 
line 703, in get_property
    r = self.conn.conn.core.GetProperty(
  File "/usr/lib/python3.9/site-packages/xcffib/xproto.py", line 2720, in 
GetProperty
    return self.send_request(20, buf, GetPropertyCookie, 
is_checked=is_checked)
  File "/usr/lib/python3.9/site-packages/xcffib/__init__.py", line 391, in 
send_request
    seq = self.conn.send_request(flags, xcb_parts + 2, xcb_req)
  File "/usr/lib/python3.9/site-packages/xcffib/__init__.py", line 569, in 
wrapper
    self.invalid()
  File "/usr/lib/python3.9/site-packages/xcffib/__init__.py", line 556, in 
invalid
    raise XcffibException("Invalid connection.")
xcffib.XcffibException: Invalid connection.
2021-02-26 23:09:02,702 ERROR libqtile base.py:on_done():L542 Failed to 
reschedule.
Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/libqtile/widget/base.py", line 
534, in on_done
    self.update(result)
  File "/usr/lib/python3.9/site-packages/libqtile/widget/base.py", line 
550, in update
    old_width = self.layout.width
  File "/usr/lib/python3.9/site-packages/libqtile/drawer.py", line 80, in 
width
    return self.layout.get_pixel_size()[0]
  File "/usr/lib/python3.9/site-packages/libqtile/pangocffi.py", line 132, 
in get_pixel_size
    pango.pango_layout_get_pixel_size(self._pointer, width, height)
TypeError: initializer for ctype 'PangoLayout *' must be a cdata pointer, 
not NoneType
2021-02-26 23:09:02,708 WARNING libqtile lifecycle.py:_atexit():L34 
Restarting Qtile with os.execv(...)
```

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