TypeError when selecting player tool

[codewarrior0]

Selecting the player tool produces this error on both 1.2.4.0 and master.

[   ERROR][                    root.py:50]:Exception:
Traceback (most recent call last):
  File "c:\Users\Rio\Documents\src\MCEdit-Unified\mceutils.py", line 44, in _alertException
    return func(*args, **kw)
  File "c:\Users\Rio\Documents\src\MCEdit-Unified\editortools\player.py", line 718, in toolSelected
    self.showPanel()
  File "c:\Users\Rio\Documents\src\MCEdit-Unified\editortools\player.py", line 582, in showPanel
    self.panel = PlayerPositionPanel(self)
  File "c:\Users\Rio\Documents\src\MCEdit-Unified\editortools\player.py", line 372, in __init__
    self.player_UUID[version_utils.playercache.getPlayerFromUUID(player)] = player
TypeError: unhashable type: 'dict'

Error does not occur after removing my player file from playerdata/

[Podshot]

Can you send us your usercache.json? If you're running in portable mode, it should be one directory above the executable. If you're in Fixed mode, it should be in a MCEdit folder in your documents

[codewarrior0]

[
  {
    "Playername": {
      "name": "codewarrior"
    },
    "Timstamp": 1420048124.866,
    "WasSuccessful": true,
    "UUID (No Separator)": "a1f04ccde5354a34ae5fb05084e5888f",
    "UUID (Separator)": "a1f04ccd-e535-4a34-ae5f-b05084e5888f"
  }
]

UUID matches the file under playerdata/

[Podshot]

Can you delete the usercache.json and relaunch? The cache seems to have merged the response into the cache file.

[codewarrior0]

New error after removing usercache.json:

[   ERROR][                    root.py:50]:Exception:
Traceback (most recent call last):
  File "c:\Users\Rio\Documents\src\MCEdit-Unified\mceutils.py", line 44, in _alertException
    return func(*args, **kw)
  File "c:\Users\Rio\Documents\src\MCEdit-Unified\editortools\player.py", line 718, in toolSelected
    self.showPanel()
  File "c:\Users\Rio\Documents\src\MCEdit-Unified\editortools\player.py", line 582, in showPanel
    self.panel = PlayerPositionPanel(self)
  File "c:\Users\Rio\Documents\src\MCEdit-Unified\editortools\player.py", line 376, in __init__
    players = sorted(self.player_UUID.keys(), key=lambda x: False if x == "Player" else x.lower())
  File "c:\Users\Rio\Documents\src\MCEdit-Unified\editortools\player.py", line 376, in <lambda>
    players = sorted(self.player_UUID.keys(), key=lambda x: False if x == "Player" else x.lower())
AttributeError: 'NoneType' object has no attribute 'lower'

New usercache.json:

[
  {
    "Playername": "codewarrior",
    "Timstamp": 1420050974.636,
    "WasSuccessful": true,
    "UUID (No Separator)": "a1f04ccde5354a34ae5fb05084e5888f",
    "UUID (Separator)": "a1f04ccd-e535-4a34-ae5f-b05084e5888f"
  }
]

No errors after second relaunch. Removing the usercache again and relaunching produces the above error again.