App v0.4.38 crash due to Logs menu on Windows

[DEBUG  ] [Cache       ] register <textinput.label> with limit=None, timeout=60.
0
[DEBUG  ] [Cache       ] register <textinput.width> with limit=None, timeout=60.
0
[INFO   ] [Base        ] Leaving application in progress...
[ERROR  ] [WaverianApp ] Uncaught exception: Invalid format string
NoneType: None
<<<<<<<<<<<<<<<<
 Error in sys.excepthook:
 Traceback (most recent call last):
   File "utils\__init__.py", line 22, in waverian_exception_handler
     * :class:`~kivy.modules.showborder`: Show widget's border.
 NameError: name 'Config' is not defined

 Original exception was:
 Traceback (most recent call last):
   File "main.py", line 426, in <module>
     WaverianApp().run()
   File "kivy\app.py", line 950, in run
   File "kivy\base.py", line 582, in runTouchApp
   File "kivy\base.py", line 347, in mainloop
   File "kivy\base.py", line 391, in idle
   File "kivy\base.py", line 342, in dispatch_input
   File "kivy\base.py", line 308, in post_dispatch_input
   File "kivy\_event.pyx", line 709, in kivy._event.EventDispatcher.dispatch
   File "kivy\uix\behaviors\button.py", line 179, in on_touch_up
   File "kivy\_event.pyx", line 705, in kivy._event.EventDispatcher.dispatch
   File "kivy\_event.pyx", line 1248, in kivy._event.EventObservers.dispatch
   File "kivy\_event.pyx", line 1132, in kivy._event.EventObservers._dispatch
   File "kivy\lang\builder.py", line 57, in custom_callback
   File "<string>", line 77, in <module>
   File "utils\__init__.py", line 155, in load_screen
     except ImportError:
   File "C:\Users\user\AppData\Local\Temp\_MEI106242\uix\screens\errorreportings
creen.py", line 152, in __init__
     timepattern = strftime(log_name)
 ValueError: Invalid format string

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
   File "main.py", line 431, in <module>
     raise RuntimeError(err)
 RuntimeError: Invalid format string
[9100] Failed to execute script 'main' due to unhandled exception!

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