Cannot read properties of undefined (reading 'show')

[Quentin62]

Type: Bug

Behaviour

When I select python code and hit shift + Enter for the first time, a python terminal starts, the python code is not run in ther terminal and a window opens with the message "Cannot read properties of undefined (reading 'show')"

I use zsh terminal, poetry as env manager and ipython as python terminal.

I have the following parameters:

"python.experiments.optOutFrom": ["pythonTerminalEnvVarActivation"],
"python.useEnvironmentsExtension": true,
// "python-envs.terminal.autoActivationType": "shellStartup",
"python-envs.defaultEnvManager": "ms-python.python:poetry",
"python-envs.defaultPackageManager": "ms-python.python:poetry",

When I uncomment "python-envs.terminal.autoActivationType": "shellStartup", the code is usually run in the zsh terminal and the python terminal is not active

Steps to reproduce:

Capture.video.du.2025-10-31.15-42-21.webm

Diagnostic data

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

XXX

Extension version: 1.10.0
VS Code version: Code 1.105.1 (7d842fb85a0275a4a8e4d7e040d2625abbf7f084, 2025-10-14T22:33:36.618Z)
OS version: Linux x64 6.14.0-34-generic
Modes:

System Info

Item	Value
CPUs	13th Gen Intel(R) Core(TM) i7-13620H (16 x 400)
GPU Status	2d_canvas: enabled direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off trees_in_viz: disabled_off video_decode: enabled video_encode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off webnn: disabled_off
Load (avg)	1, 1, 1
Memory (System)	31.04GB (17.40GB free)
Process Argv	--crash-reporter-id a87c9fe0-82ab-4ddf-93a4-a8ee0d063686
Screen Reader	no
VM	0%
DESKTOP_SESSION	ubuntu
XDG_CURRENT_DESKTOP	Unity
XDG_SESSION_DESKTOP	ubuntu
XDG_SESSION_TYPE	x11

A/B Experiments

vsliv368:30146709
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
aj953862:31281341
nes-set-on:31351930
6abeh943:31336334
envsdeactivate2:31353495
aa_c:31379599
gendocstringf:31405073
0574c672:31404437
cloudbuttont:31379625
todos-1:31405332
v66_all_req:31402695
treatment_gpt5applypatchexclusively:31398171
3efgi100_wstrepl:31403338
trigger-command-fix:31379601
auto_model_enabled:31385282
use-responses-api:31390855
applesignin:31399435
2a0ce269:31405347
ff8f5884:31411053

[Quentin62]

I don't have the message "Cannot read properties of undefined (reading 'show')" since the last update.

Now I have the following message and the python terminal is not launched:

When I select a python interpreter and retry, I have always the same message and issue.
When I set "python.useEnvironmentsExtension": false, the python terminal is running but the selected code is run in the zsh terminal before the activation of the python terminal

[anthonykim1]

Im glad you dont see "Cannot read properties of undefined (reading 'show')"

To get the python environment to activate before your command, you need shell startup from environment extension

Try with latest insiders and latest pre-release of Python env extension.

[Quentin62]

I got a new laptop at work and had to make a new configuration for ubuntu on WSL and the problem is still there:
When I use the python environment and run selected code, awindow "Cannot read properties of undefined (reading 'show')" appears and the code is not run in the activated environment

I'm using python environment v1.14.0

parameters

    "python.useEnvironmentsExtension": true,
    "python-envs.terminal.autoActivationType": "shellStartup",
    "python-envs.defaultEnvManager": "ms-python.python:poetry",

vscode added this to my .zshrc file

# >>> vscode python
# version: 0.1.1
if [ -z "$VSCODE_PYTHON_AUTOACTIVATE_GUARD" ]; then
    export VSCODE_PYTHON_AUTOACTIVATE_GUARD=1
    if [ -n "$VSCODE_PYTHON_ZSH_ACTIVATE" ] && [ "$TERM_PROGRAM" = "vscode" ]; then
        eval "$VSCODE_PYTHON_ZSH_ACTIVATE" || true
    fi
fi
# <<< vscode python

[karthiknadig]

Can you share the call stack of the error? It should be there in the logs output > Python Extension or in Help > Toggle developer tools.

[Quentin62]

I set the log at debug level and got

log of python extension

2025-12-12 14:49:17.974 [info] > /bin/python3 ~/.vscode-server/extensions/ms-python.python-2025.20.0-linux-x64/python_files/normalizeSelection.py

log of python env

2025-12-12 14:49:18.474 [debug] Activating terminal: /home/quentin/Projet/my_project/.venv/bin/python
2025-12-12 14:49:19.532 [debug] Shell execution started: source /home/quentin/Projet/my_project/.venv/bin/activate
2025-12-12 14:49:19.532 [debug] Checking venv (ms-python.python:venv) for /home/quentin/Projet/my_project/.venv/bin/python
2025-12-12 14:49:19.532 [debug] Using venv (ms-python.python:venv) to handle /home/quentin/Projet/my_project/.venv/bin/python
2025-12-12 14:49:19.555 [info] Terminal is activated: /home/quentin/Projet/my_project/.venv/bin/python
2025-12-12 14:49:19.555 [debug] Checking venv (ms-python.python:venv) for /home/quentin/Projet/my_project/.venv/bin/python
2025-12-12 14:49:19.556 [debug] Using venv (ms-python.python:venv) to handle /home/quentin/Projet/my_project/.venv/bin/python
2025-12-12 14:49:23.078 [debug] Checking venv (ms-python.python:venv) for /home/quentin/Projet/my_project/.venv/bin/python
2025-12-12 14:49:23.078 [debug] Using venv (ms-python.python:venv) to handle /home/quentin/Projet/my_project/.venv/bin/python
2025-12-12 14:49:23.198 [debug] Checking venv (ms-python.python:venv) for /home/quentin/Projet/my_project/.venv/bin/python
2025-12-12 14:49:23.198 [debug] Using venv (ms-python.python:venv) to handle /home/quentin/Projet/my_project/.venv/bin/python

log of "Extension Host (remote)"

2025-12-12 14:49:19.532 [error] TypeError: Cannot read properties of undefined (reading 'show')
	at b.executeCommand (/home/quentin/.vscode-server/extensions/ms-python.python-2025.20.0-linux-x64/out/client/extension.js:2:316843)
	at y.executeCommand (/home/quentin/.vscode-server/extensions/ms-python.python-2025.20.0-linux-x64/out/client/extension.js:2:331216)
	at E.execute (/home/quentin/.vscode-server/extensions/ms-python.python-2025.20.0-linux-x64/out/client/extension.js:2:892308)
	at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
	at async P.executeSelection (/home/quentin/.vscode-server/extensions/ms-python.python-2025.20.0-linux-x64/out/client/extension.js:2:877143)
	at async P.executeSelectionInTerminal (/home/quentin/.vscode-server/extensions/ms-python.python-2025.20.0-linux-x64/out/client/extension.js:2:876605)
	at async /home/quentin/.vscode-server/extensions/ms-python.python-2025.20.0-linux-x64/out/client/extension.js:2:874599
	at async cA.h (file:///home/quentin/.vscode-server/bin/618725e67565b290ba4da6fe2d29f8fa1d4e3622/out/vs/workbench/api/node/extensionHostProcess.js:116:41740) python.execSelectionInTerminal {"value":"ms-python.python","_lower":"ms-python.python"}