Error while closing project just after Spyder starts

[dalthviz]

Description

What steps will reproduce the problem?

This happened while I was checking #21483. Maybe it was caused since I closed a project with a lot of files open while Spyder was still initializing things

Traceback

Traceback (most recent call last):
  File "C:\Users\dalth\AppData\Local\spyder-6\envs\spyder-runtime\lib\site-packages\spyder\plugins\ipythonconsole\plugin.py", line 886, in update_path
    self.get_widget().update_path(path_dict, new_path_dict)
  File "C:\Users\dalth\AppData\Local\spyder-6\envs\spyder-runtime\lib\site-packages\spyder\plugins\ipythonconsole\widgets\main_widget.py", line 2136, in update_path
    shell.update_syspath(path_dict, new_path_dict)
  File "C:\Users\dalth\AppData\Local\spyder-6\envs\spyder-runtime\lib\site-packages\spyder\plugins\ipythonconsole\widgets\shell.py", line 652, in update_syspath
    self.call_kernel(
  File "C:\Users\dalth\AppData\Local\spyder-6\envs\spyder-runtime\lib\site-packages\spyder\plugins\ipythonconsole\widgets\shell.py", line 334, in call_kernel
    return self.kernel_handler.kernel_comm.remote_call(
AttributeError: 'NoneType' object has no attribute 'kernel_comm'

Versions

• Spyder version: 5.4.5 6 (standalone)
• Python version: 3.10.12 64-bit
• Qt version: 5.15.8
• PyQt5 version: 5.15.9
• Operating System: Windows-10-10.0.19045-SP0

Dependencies

# Mandatory:
atomicwrites >=1.2.0              :  1.4.1 (OK)
chardet >=2.0.0                   :  5.2.0 (OK)
cloudpickle >=0.5.0               :  2.2.1 (OK)
cookiecutter >=1.6.0              :  2.3.0 (OK)
diff_match_patch >=20181111       :  20230430 (OK)
intervaltree >=3.0.2              :  3.1.0 (OK)
IPython >=8.13.0,<9.0.0,!=8.17.1  :  8.15.0 (OK)
jedi >=0.17.2,<0.20.0             :  0.18.2 (OK)
jellyfish >=0.7                   :  1.0.0 (OK)
jsonschema >=3.2.0                :  4.19.0 (OK)
keyring >=17.0.0                  :  24.2.0 (OK)
nbconvert >=4.0                   :  7.8.0 (OK)
numpydoc >=0.6.0                  :  1.5.0 (OK)
paramiko >=2.4.0                  :  3.3.1 (OK)
parso >=0.7.0,<0.9.0              :  0.8.3 (OK)
pexpect >=4.4.0                   :  4.8.0 (OK)
pickleshare >=0.4                 :  0.7.5 (OK)
psutil >=5.3                      :  5.9.5 (OK)
pygments >=2.0                    :  2.16.1 (OK)
pylint >=2.5.0,<3.1               :  2.17.5 (OK)
pylint_venv >=3.0.2               :  3.0.2 (OK)
pyls_spyder >=0.4.0               :  0.4.0 (OK)
pylsp >=1.9.0,<1.10.0             :  1.9.0 (OK)
pylsp_black >=1.2.0,<3.0.0        :  1.3.0 (OK)
pyuca >=1.2                       :  1.2 (OK)
qdarkstyle >=3.2.0,<3.3.0         :  3.2 (OK)
qstylizer >=0.2.2                 :  0.2.2 (OK)
qtawesome >=1.2.1                 :  1.2.3 (OK)
qtconsole >=5.5.0,<5.6.0          :  5.6.0.dev0 (OK)
qtpy >=2.1.0                      :  2.4.0 (OK)
rtree >=0.9.7                     :  1.0.1 (OK)
setuptools >=49.6.0               :  68.1.2 (OK)
sphinx >=0.6.6                    :  7.2.5 (OK)
spyder_kernels >=3.0.0b2,<3.0.0b3 :  3.0.0.dev0 (OK)
superqt >=0.6.1,<1.0.0            :  0.6.1 (OK)
textdistance >=4.2.0              :  4.5.0 (OK)
three_merge >=0.1.1               :  0.1.1 (OK)
watchdog >=0.10.3                 :  3.0.0 (OK)
zmq >=22.1.0                      :  25.1.1 (OK)

# Optional:
cython >=0.21                     :  3.0.2 (OK)
matplotlib >=3.0.0                :  3.7.2 (OK)
numpy >=1.7                       :  1.25.2 (OK)
pandas >=1.1.1                    :  2.1.0 (OK)
scipy >=0.17.0                    :  1.11.2 (OK)
sympy >=0.7.3                     :  1.12 (OK)

[dalthviz]

I was able to reproduce this by trying to reopen a project already open. The current IPython console at the moment was on a failed initialization state due to an incorrect spyder-kernels (a custom interpreter was set and had spyder-kernels < 3.0.0):

Traceback (most recent call last):
  File "C:\Users\dalth\AppData\Local\spyder-6\envs\spyder-runtime\Lib\site-packages\spyder\plugins\ipythonconsole\plugin.py", line 1003, in update_path
    self.get_widget().update_path(path_dict, new_path_dict)
  File "C:\Users\dalth\AppData\Local\spyder-6\envs\spyder-runtime\Lib\site-packages\spyder\plugins\ipythonconsole\widgets\main_widget.py", line 2456, in update_path
    shell.update_syspath(path_dict, new_path_dict)
  File "C:\Users\dalth\AppData\Local\spyder-6\envs\spyder-runtime\Lib\site-packages\spyder\plugins\ipythonconsole\widgets\shell.py", line 709, in update_syspath
    self.call_kernel(
  File "C:\Users\dalth\AppData\Local\spyder-6\envs\spyder-runtime\Lib\site-packages\spyder\plugins\ipythonconsole\widgets\shell.py", line 372, in call_kernel
    return self.kernel_handler.kernel_comm.remote_call(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'kernel_comm'
Traceback (most recent call last):
  File "C:\Users\dalth\AppData\Local\spyder-6\envs\spyder-runtime\Lib\site-packages\spyder\plugins\ipythonconsole\plugin.py", line 1003, in update_path
    self.get_widget().update_path(path_dict, new_path_dict)
  File "C:\Users\dalth\AppData\Local\spyder-6\envs\spyder-runtime\Lib\site-packages\spyder\plugins\ipythonconsole\widgets\main_widget.py", line 2456, in update_path
    shell.update_syspath(path_dict, new_path_dict)
  File "C:\Users\dalth\AppData\Local\spyder-6\envs\spyder-runtime\Lib\site-packages\spyder\plugins\ipythonconsole\widgets\shell.py", line 709, in update_syspath
    self.call_kernel(
  File "C:\Users\dalth\AppData\Local\spyder-6\envs\spyder-runtime\Lib\site-packages\spyder\plugins\ipythonconsole\widgets\shell.py", line 372, in call_kernel
    return self.kernel_handler.kernel_comm.remote_call(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'kernel_comm'

[ccordoba12]

I think this is just a matter of checking if kernel_comm is available in call_kernel. That will not only deal with this problem but similar ones in the future (i.e. trying to comunicate with the kernel when that's not possible yet).

I'll take care of it.