Kernel Restart Error - AttributeError: 'NoneType' object has no attribute 'switch_to_plugin'

[Cnoized]

Description

What steps will reproduce the problem?

Restarted kernel after using pip installer. Had been working on some code and needed a new package.

Traceback

Traceback (most recent call last):
  File "C:\Users\Christopher\AppData\Local\spyder-6\envs\spyder-runtime\Lib\site-packages\spyder\app\mainwindow.py", line 546, in switch_to_plugin
    self.layouts.switch_to_plugin(plugin, force_focus=force_focus)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'switch_to_plugin'

Versions

• Spyder version: 6.0.3 (standalone)
• Python version: 3.11.10 64-bit
• Qt version: 5.15.8
• PyQt5 version: 5.15.9
• Operating System: Windows-10-10.0.26100-SP0

Dependencies

# Mandatory:
aiohttp >=3.9.3                  :  3.11.10 (OK)
asyncssh >=2.14.0,<3.0.0         :  2.18.0 (OK)
atomicwrites >=1.2.0             :  1.4.1 (OK)
chardet >=2.0.0                  :  5.2.0 (OK)
cloudpickle >=0.5.0              :  3.1.0 (OK)
cookiecutter >=1.6.0             :  2.6.0 (OK)
diff_match_patch >=20181111      :  20241021 (OK)
github >=2.3.0                   :  2.5.0 (OK)
importlib_metadata >=4.6.0       :  8.5.0 (OK)
intervaltree >=3.0.2             :  3.1.0 (OK)
IPython >=8.13.0,<9.0.0,!=8.17.1 :  8.30.0 (OK)
jedi >=0.17.2,<0.20.0            :  0.19.2 (OK)
jellyfish >=0.7                  :  1.1.2 (OK)
jsonschema >=3.2.0               :  4.23.0 (OK)
keyring >=17.0.0                 :  25.5.0 (OK)
nbconvert >=4.0                  :  7.16.4 (OK)
numpydoc >=0.6.0                 :  1.8.0 (OK)
parso >=0.7.0,<0.9.0             :  0.8.4 (OK)
pexpect >=4.4.0                  :  4.9.0 (OK)
pickleshare >=0.4                :  0.7.5 (OK)
psutil >=5.3                     :  6.1.0 (OK)
pygments >=2.0                   :  2.18.0 (OK)
pylint >=3.1,<4                  :  3.3.2 (OK)
pylint_venv >=3.0.2              :  3.0.4 (OK)
pyls_spyder >=0.4.0              :  0.4.0 (OK)
pylsp >=1.12.0,<1.13.0           :  1.12.0 (OK)
pylsp_black >=2.0.0,<3.0.0       :  2.0.0 (OK)
pyuca >=1.2                      :  1.2 (OK)
qdarkstyle >=3.2.0,<3.3.0        :  3.2.3 (OK)
qstylizer >=0.2.2                :  0.2.4 (OK)
qtawesome >=1.3.1,<1.4.0         :  1.3.1 (OK)
qtconsole >=5.6.1,<5.7.0         :  5.6.1 (OK)
qtpy >=2.4.0                     :  2.4.2 (OK)
rtree >=0.9.7                    :  1.3.0 (OK)
setuptools >=49.6.0              :  75.6.0 (OK)
sphinx >=0.6.6                   :  8.1.3 (OK)
spyder_kernels >=3.0.2,<3.1.0    :  3.0.2 (OK)
superqt >=0.6.2,<1.0.0           :  0.6.7 (OK)
textdistance >=4.2.0             :  4.6.2 (OK)
three_merge >=0.1.1              :  0.1.1 (OK)
watchdog >=0.10.3                :  6.0.0 (OK)
yarl >=1.9.4                     :  1.18.3 (OK)
zmq >=24.0.0                     :  26.2.0 (OK)

# Optional:
cython >=0.21                    :  3.0.11 (OK)
matplotlib >=3.0.0               :  3.9.3 (OK)
numpy >=1.7                      :  2.2.0 (OK)
pandas >=1.1.1                   :  2.2.3 (OK)
scipy >=0.17.0                   :  1.14.1 (OK)
sympy >=0.7.3                    :  1.13.3 (OK)

[dalthviz]

Hi @Cnoized thank you for the report! I think this is a duplicate of #22639. Could it be possible for you to check #22639 (comment) and post any new finding there (a new comment over #22639) ?

Any further info to debug this is greatly appreciated. Let us know!