运行trollil 例子出现'NoneType' object has no attribute 'width'错误，原因是flet_core\page.py:466 ctrl.page = None 将其赋值为None，请问是什么问题导致的呢

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Question

我安装以下步骤运行，然后收到'NoneType' object has no attribute 'width'异常

git clone https://github.com/flet-dev/examples.git
cd examples\python\apps\trolli
pip3 install -r requirements.txt
python3 ./src/main.py
Unhandled error processing page session : Traceback (most recent call last):
  File "D:\Procedure\LanguageInterpreter\Python310\lib\site-packages\flet_runtime\app.py", line 363, in on_session_created
    session_handler(page)
  File "E:\SourceCode\gitlab\examples\python\apps\trolli\src\main.py", line 207, in main
    app.initialize()
  File "E:\SourceCode\gitlab\examples\python\apps\trolli\src\main.py", line 86, in initialize
    self.create_new_board("My First Board")
  File "E:\SourceCode\gitlab\examples\python\apps\trolli\src\main.py", line 187, in create_new_board
    new_board = Board(self, self.store, board_name)
  File "E:\SourceCode\gitlab\examples\python\apps\trolli\src\board.py", line 49, in __init__
    width=(self.app.page.width - 310),
AttributeError: 'NoneType' object has no attribute 'width'

经过分析发现在src\main.py:83 self.page.update()后self.page就会等于None
跟踪下去是flet_core\page.py:466 ctrl.page = None 将其赋值为None

请问是什么问题导致的呢，以下是我的版本

Python 3.10.7
flet 0.12.0
flet-core 0.12.0
flet-fastapi 0.12.0
flet-runtime 0.12.0

我将flet_core\page.py:466 ctrl.page = None 改为 if ctrl.page != self: ctrl.page = None 就不出现这个异常了，我不了解为啥需要设置为None

Code sample

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Error message

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