Window close: tool_instance is None

[chimerax-bug-report@…]

The following bug report has been submitted:
Platform:        Windows-10-10.0.26100
ChimeraX Version: 1.10.1 (2025-07-24 20:15:27 UTC)
Description
Replace this text with list of actions that caused this problem to occur

Log:
Startup Messages  
---  
note | available bundle cache has not been initialized yet  
  
You can double click a model's Name or ID in the model panel to edit those
fields  
UCSF ChimeraX version: 1.10.1 (2025-07-24)  
© 2016-2025 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open 4I29

Summary of feedback from opening 4I29 fetched from pdb  
---  
notes | Fetching compressed mmCIF 4i29 from http://files.rcsb.org/download/4i29.cif  
Fetching CCD 8BA from
https://files.wwpdb.org/pub/pdb/refdata/chem_comp/A/8BA/8BA.cif  
Fetching CCD MN from
https://files.wwpdb.org/pub/pdb/refdata/chem_comp/N/MN/MN.cif  
Fetching CCD NA from
https://files.wwpdb.org/pub/pdb/refdata/chem_comp/A/NA/NA.cif  
  
4i29 title:  
Binary complex of mouse TdT with ssDNA and Mn++ [more info...]  
  
Chain information for 4i29 #1  
---  
Chain | Description | UniProt  
A | DNA nucleotidylexotransferase | TDT_MOUSE 132-482 483-510  
C | 5'-D(*AP*AP*(8BA)P*AP*A)-3' |   
  
Non-standard residues in 4i29 #1  
---  
MN — manganese (II) ion  
NA — sodium ion  
  
42 atoms have alternate locations. Control/examine alternate locations with
Altloc Explorer [start tool...] or the altlocs command.  

> show target m

> style ball

Changed 3344 atom styles  

> style ball

Changed 3344 atom styles  

> style ball

Changed 3344 atom styles  

> style sphere

Changed 3344 atom styles  

> style sphere

Changed 3344 atom styles  

> style stick

Changed 3344 atom styles  

> sequence chain #1/A

Alignment identifier is 1/A  

> select
> /A:153-157,165-182,184-200,207-212,218-232,234-254,259-269,273-279,286-301,305-323,331-336,354-372,413-415,439-469,490-499,504-508

1682 atoms, 1698 bonds, 209 residues, 1 model selected  

> open P09838 fromDatabase uniprot associate #1/A

Summary of feedback from opening P09838 fetched from uniprot  
---  
notes | Fetching compressed P09838 UniProt info from https://www.uniprot.org/uniprot/P09838.xml  
Alignment identifier is P09838  
Associated 4i29 chain A to P09838 with 19 mismatches  
  
Opened UniProt P09838  

> open P09838 fromDatabase uniprot associate #1/A

Summary of feedback from opening P09838 fetched from uniprot  
---  
notes | Destroying pre-existing alignment with identifier P09838  
Alignment identifier is P09838  
Associated 4i29 chain A to P09838 with 19 mismatches  
  
Opened UniProt P09838  

> open P09838 fromDatabase uniprot associate #1/A

Summary of feedback from opening P09838 fetched from uniprot  
---  
notes | Destroying pre-existing alignment with identifier P09838  
Alignment identifier is P09838  
Associated 4i29 chain A to P09838 with 19 mismatches  
  
Opened UniProt P09838  

> open P09838 fromDatabase uniprot associate #1/A

Summary of feedback from opening P09838 fetched from uniprot  
---  
notes | Destroying pre-existing alignment with identifier P09838  
Alignment identifier is P09838  
Associated 4i29 chain A to P09838 with 19 mismatches  
  
Opened UniProt P09838  
Traceback (most recent call last):  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 2524, in <lambda>  
dw.closeEvent = lambda e, *, tw=tool_window, mw=mw: mw.close_request(tw, e)  
^^^^^^^^^^^^^^^^^^^^^^^  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 845, in close_request  
all_windows = self.tool_instance_to_windows[tool_instance]  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^  
KeyError: None  
  
KeyError: None  
  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 845, in close_request  
all_windows = self.tool_instance_to_windows[tool_instance]  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 2524, in <lambda>  
dw.closeEvent = lambda e, *, tw=tool_window, mw=mw: mw.close_request(tw, e)  
^^^^^^^^^^^^^^^^^^^^^^^  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 845, in close_request  
all_windows = self.tool_instance_to_windows[tool_instance]  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^  
KeyError: None  
  
KeyError: None  
  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 845, in close_request  
all_windows = self.tool_instance_to_windows[tool_instance]  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^  
  
See log for complete Python traceback.  
  

> open P09838 fromDatabase uniprot associate #1/A

Summary of feedback from opening P09838 fetched from uniprot  
---  
notes | Destroying pre-existing alignment with identifier P09838  
Alignment identifier is P09838  
Associated 4i29 chain A to P09838 with 19 mismatches  
  
Opened UniProt P09838  
Traceback (most recent call last):  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 2524, in <lambda>  
dw.closeEvent = lambda e, *, tw=tool_window, mw=mw: mw.close_request(tw, e)  
^^^^^^^^^^^^^^^^^^^^^^^  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 845, in close_request  
all_windows = self.tool_instance_to_windows[tool_instance]  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^  
KeyError: None  
  
KeyError: None  
  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 845, in close_request  
all_windows = self.tool_instance_to_windows[tool_instance]  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^  
  
See log for complete Python traceback.  
  

> open P09838 fromDatabase uniprot associate #1/A

Summary of feedback from opening P09838 fetched from uniprot  
---  
notes | Destroying pre-existing alignment with identifier P09838  
Alignment identifier is P09838  
Associated 4i29 chain A to P09838 with 19 mismatches  
  
Opened UniProt P09838  
Traceback (most recent call last):  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 2524, in <lambda>  
dw.closeEvent = lambda e, *, tw=tool_window, mw=mw: mw.close_request(tw, e)  
^^^^^^^^^^^^^^^^^^^^^^^  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 845, in close_request  
all_windows = self.tool_instance_to_windows[tool_instance]  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^  
KeyError: None  
  
KeyError: None  
  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 845, in close_request  
all_windows = self.tool_instance_to_windows[tool_instance]  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^  
  
See log for complete Python traceback.  
  
Traceback (most recent call last):  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 2524, in <lambda>  
dw.closeEvent = lambda e, *, tw=tool_window, mw=mw: mw.close_request(tw, e)  
^^^^^^^^^^^^^^^^^^^^^^^  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 845, in close_request  
all_windows = self.tool_instance_to_windows[tool_instance]  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^  
KeyError: None  
  
KeyError: None  
  
File "C:\Program Files\ChimeraX 1.10.1\bin\Lib\site-
packages\chimerax\ui\gui.py", line 845, in close_request  
all_windows = self.tool_instance_to_windows[tool_instance]  
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^  
  
See log for complete Python traceback.  
  

> sequence chain #1/A

Destroying pre-existing alignment with identifier 1/A  
Alignment identifier is 1/A  

> sequence chain #1/A

Destroying pre-existing alignment with identifier 1/A  
Alignment identifier is 1/A  

> sequence chain #1/A

Destroying pre-existing alignment with identifier 1/A  
Alignment identifier is 1/A  




OpenGL version: 3.3.0 - Build 30.0.100.9836
OpenGL renderer: Intel(R) Iris(R) Xe Graphics
OpenGL vendor: Intel

Python: 3.11.4
Locale: en_US.cp1252
Qt version: PyQt6 6.8.1, Qt 6.8.2
Qt runtime version: 6.8.2
Qt platform: windows

Manufacturer: LG Electronics
Model: 17Z90P-K.AAC8U1
OS: Microsoft Windows 11 Home (Build 26100)
Memory: 16,873,873,408
MaxProcessMemory: 137,438,953,344
CPU: 8 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz
OSLanguage: en-US

Installed Packages:
    alabaster: 1.0.0
    appdirs: 1.4.4
    asttokens: 3.0.0
    babel: 2.17.0
    beautifulsoup4: 4.13.3
    blockdiag: 3.0.0
    blosc2: 3.6.1
    build: 1.2.2.post1
    certifi: 2025.7.14
    cftime: 1.6.4.post1
    charset-normalizer: 3.4.2
    ChimeraX-AddCharge: 1.5.19
    ChimeraX-AddH: 2.2.7
    ChimeraX-AlignmentAlgorithms: 2.0.2
    ChimeraX-AlignmentHdrs: 3.6.1
    ChimeraX-AlignmentMatrices: 2.1
    ChimeraX-Alignments: 2.20.2
    ChimeraX-AlphaFold: 1.0.1
    ChimeraX-AltlocExplorer: 1.1.2
    ChimeraX-AmberInfo: 1.0
    ChimeraX-Aniso: 1.1.4
    ChimeraX-Arrays: 1.1
    ChimeraX-Atomic: 1.60.7
    ChimeraX-AtomicLibrary: 14.1.19
    ChimeraX-AtomSearch: 2.0.1
    ChimeraX-AxesPlanes: 2.4
    ChimeraX-BasicActions: 1.1.3
    ChimeraX-BILD: 1.0
    ChimeraX-BlastProtein: 3.0.0
    ChimeraX-Boltz: 1.0
    ChimeraX-BondRot: 2.0.4
    ChimeraX-BugReporter: 1.0.2
    ChimeraX-BuildStructure: 2.13.1
    ChimeraX-Bumps: 1.0
    ChimeraX-BundleBuilder: 1.5.1
    ChimeraX-ButtonPanel: 1.0.1
    ChimeraX-CageBuilder: 1.0.1
    ChimeraX-CellPack: 1.0
    ChimeraX-Centroids: 1.4
    ChimeraX-ChangeChains: 1.1
    ChimeraX-CheckWaters: 1.5
    ChimeraX-ChemGroup: 2.0.2
    ChimeraX-Clashes: 2.3
    ChimeraX-ColorActions: 1.0.5
    ChimeraX-ColorGlobe: 1.0
    ChimeraX-ColorKey: 1.5.8
    ChimeraX-CommandLine: 1.3
    ChimeraX-ConnectStructure: 2.0.1
    ChimeraX-Contacts: 1.0.1
    ChimeraX-Core: 1.10.1
    ChimeraX-CoreFormats: 1.2
    ChimeraX-coulombic: 1.4.5
    ChimeraX-Crosslinks: 1.0
    ChimeraX-Crystal: 1.0
    ChimeraX-CrystalContacts: 1.0.1
    ChimeraX-DataFormats: 1.2.4
    ChimeraX-Dicom: 1.2.7
    ChimeraX-DistMonitor: 1.4.2
    ChimeraX-DockPrep: 1.1.4
    ChimeraX-Dssp: 2.0
    ChimeraX-EMDB-SFF: 1.0
    ChimeraX-ESMFold: 1.0
    ChimeraX-FileHistory: 1.0.1
    ChimeraX-FunctionKey: 1.0.1
    ChimeraX-Geometry: 1.3
    ChimeraX-gltf: 1.0
    ChimeraX-Graphics: 1.4.1
    ChimeraX-Hbonds: 2.5.1
    ChimeraX-Help: 1.3
    ChimeraX-HKCage: 1.3
    ChimeraX-IHM: 1.1
    ChimeraX-ImageFormats: 1.2
    ChimeraX-IMOD: 1.0
    ChimeraX-IO: 1.0.3
    ChimeraX-ItemsInspection: 1.0.1
    ChimeraX-IUPAC: 1.0
    ChimeraX-KVFinder: 1.6.2
    ChimeraX-Label: 1.1.14
    ChimeraX-ListInfo: 1.2.2
    ChimeraX-Log: 1.2
    ChimeraX-LookingGlass: 1.1
    ChimeraX-Maestro: 1.9.1
    ChimeraX-Map: 1.3
    ChimeraX-MapData: 2.0
    ChimeraX-MapEraser: 1.0.1
    ChimeraX-MapFilter: 2.0.1
    ChimeraX-MapFit: 2.0
    ChimeraX-MapSeries: 2.1.1
    ChimeraX-Markers: 1.0.1
    ChimeraX-Mask: 1.0.2
    ChimeraX-MatchMaker: 2.2.2
    ChimeraX-MCopy: 1.0
    ChimeraX-MDcrds: 2.10.1
    ChimeraX-MedicalToolbar: 1.1
    ChimeraX-Meeting: 1.0.1
    ChimeraX-MLP: 1.1.1
    ChimeraX-mmCIF: 2.16
    ChimeraX-MMTF: 2.2
    ChimeraX-ModelArchive: 1.0
    ChimeraX-Modeller: 1.5.19
    ChimeraX-ModelPanel: 1.5.1
    ChimeraX-ModelSeries: 1.0.1
    ChimeraX-Mol2: 2.0.3
    ChimeraX-Mole: 1.0
    ChimeraX-Morph: 1.0.2
    ChimeraX-MouseModes: 1.2
    ChimeraX-Movie: 1.0
    ChimeraX-MutationScores: 1.0
    ChimeraX-Neuron: 1.0
    ChimeraX-Nifti: 1.2
    ChimeraX-NMRSTAR: 1.0.2
    ChimeraX-NRRD: 1.2
    ChimeraX-Nucleotides: 2.0.3
    ChimeraX-OpenCommand: 1.14.1
    ChimeraX-OrthoPick: 1.0.1
    ChimeraX-PDB: 2.7.10
    ChimeraX-PDBBio: 1.0.1
    ChimeraX-PDBLibrary: 1.0.4
    ChimeraX-PDBMatrices: 1.0
    ChimeraX-PickBlobs: 1.0.1
    ChimeraX-Positions: 1.0
    ChimeraX-PresetMgr: 1.1.3
    ChimeraX-ProfileGrids: 1.1.3
    ChimeraX-PubChem: 2.2
    ChimeraX-ReadPbonds: 1.0.1
    ChimeraX-Registration: 1.1.2
    ChimeraX-RemoteControl: 1.0
    ChimeraX-RenderByAttr: 1.6.3
    ChimeraX-RenumberResidues: 1.1
    ChimeraX-ResidueFit: 1.0.1
    ChimeraX-RestServer: 1.3.1
    ChimeraX-RNALayout: 1.0
    ChimeraX-RotamerLibMgr: 4.0
    ChimeraX-RotamerLibsDunbrack: 2.0
    ChimeraX-RotamerLibsDynameomics: 2.0
    ChimeraX-RotamerLibsRichardson: 2.0
    ChimeraX-SaveCommand: 1.5.1
    ChimeraX-SchemeMgr: 1.0
    ChimeraX-SDF: 2.0.3
    ChimeraX-Segger: 1.0
    ChimeraX-Segment: 1.0.1
    ChimeraX-Segmentations: 3.5.7
    ChimeraX-SelInspector: 1.0
    ChimeraX-SeqView: 2.17.1
    ChimeraX-Shape: 1.1
    ChimeraX-Shell: 1.0.1
    ChimeraX-Shortcuts: 1.2.1
    ChimeraX-ShowSequences: 1.0.3
    ChimeraX-SideView: 1.0.1
    ChimeraX-SimilarStructures: 1.0.1
    ChimeraX-Smiles: 2.1.2
    ChimeraX-SmoothLines: 1.0
    ChimeraX-SpaceNavigator: 1.0
    ChimeraX-StdCommands: 1.19.1
    ChimeraX-STL: 1.0.1
    ChimeraX-Storm: 1.0
    ChimeraX-StructMeasure: 1.2.1
    ChimeraX-Struts: 1.0.1
    ChimeraX-Surface: 1.0.1
    ChimeraX-SwapAA: 2.0.1
    ChimeraX-SwapRes: 2.5.2
    ChimeraX-TapeMeasure: 1.0
    ChimeraX-TaskManager: 1.0
    ChimeraX-Test: 1.0
    ChimeraX-Toolbar: 1.2.3
    ChimeraX-ToolshedUtils: 1.2.4
    ChimeraX-Topography: 1.0
    ChimeraX-ToQuest: 1.0
    ChimeraX-Tug: 1.0.1
    ChimeraX-UI: 1.45.2
    ChimeraX-Umap: 1.0
    ChimeraX-uniprot: 2.3.1
    ChimeraX-UnitCell: 1.0.1
    ChimeraX-ViewDockX: 1.4.4
    ChimeraX-VIPERdb: 1.0
    ChimeraX-Vive: 1.1
    ChimeraX-VolumeMenu: 1.0.1
    ChimeraX-vrml: 1.0
    ChimeraX-VTK: 1.0
    ChimeraX-WavefrontOBJ: 1.0
    ChimeraX-WebCam: 1.0.2
    ChimeraX-WebServices: 1.1.5
    ChimeraX-Zone: 1.0.1
    colorama: 0.4.6
    comm: 0.2.2
    comtypes: 1.4.10
    contourpy: 1.3.2
    coverage: 7.10.0
    cxservices: 1.2.3
    cycler: 0.12.1
    Cython: 3.0.12
    debugpy: 1.8.15
    decorator: 5.2.1
    docutils: 0.21.2
    executing: 2.2.0
    filelock: 3.18.0
    fonttools: 4.59.0
    funcparserlib: 2.0.0a0
    glfw: 2.9.0
    grako: 3.16.5
    h5py: 3.14.0
    html2text: 2024.2.26
    idna: 3.10
    ihm: 2.2
    imagecodecs: 2024.6.1
    imagesize: 1.4.1
    iniconfig: 2.1.0
    ipykernel: 6.29.5
    ipython: 8.26.0
    ipywidgets: 8.1.7
    jedi: 0.19.1
    Jinja2: 3.1.6
    jupyter_client: 8.6.3
    jupyter_core: 5.8.1
    jupyterlab_widgets: 3.0.15
    kiwisolver: 1.4.8
    line_profiler: 4.2.0
    lxml: 5.3.1
    lz4: 4.3.2
    MarkupSafe: 3.0.2
    matplotlib: 3.10.1
    matplotlib-inline: 0.1.7
    msgpack: 1.1.0
    ndindex: 1.10.0
    nest-asyncio: 1.6.0
    netCDF4: 1.6.5
    networkx: 3.3
    nibabel: 5.2.0
    nptyping: 2.5.0
    numexpr: 2.11.0
    numpy: 1.26.4
    nvidia-nvjitlink-cu12: 12.9.86
    OpenMM: 8.2.0
    OpenMM-CUDA-12: 8.2.0
    openvr: 1.26.701
    packaging: 24.2
    ParmEd: 4.2.2
    parso: 0.8.4
    pep517: 0.13.1
    pickleshare: 0.7.5
    pillow: 10.4.0
    pip: 25.0.1
    pkginfo: 1.11.1
    platformdirs: 4.3.8
    pluggy: 1.6.0
    prompt_toolkit: 3.0.51
    psutil: 7.0.0
    pure_eval: 0.2.3
    py-cpuinfo: 9.0.0
    pycollada: 0.8
    pydicom: 2.4.4
    Pygments: 2.18.0
    pynmrstar: 3.3.5
    pynrrd: 1.0.0
    PyOpenGL: 3.1.9
    PyOpenGL-accelerate: 3.1.9
    pyopenxr: 1.1.4501
    pyparsing: 3.2.3
    pyproject_hooks: 1.2.0
    PyQt6-commercial: 6.8.1
    PyQt6-Qt6: 6.8.2
    PyQt6-WebEngine-commercial: 6.8.0
    PyQt6-WebEngine-Qt6: 6.8.2
    PyQt6_sip: 13.10.0
    pytest: 8.4.1
    pytest-cov: 6.2.1
    python-dateutil: 2.9.0.post0
    pytz: 2025.2
    pywin32: 310
    pyzmq: 27.0.0
    qtconsole: 5.5.2
    QtPy: 2.4.3
    qtshim: 1.1
    RandomWords: 0.4.0
    requests: 2.32.3
    roman-numerals-py: 3.1.0
    scipy: 1.14.0
    setuptools: 78.1.0
    sfftk-rw: 0.8.1
    six: 1.16.0
    snowballstemmer: 3.0.1
    sortedcontainers: 2.4.0
    soupsieve: 2.7
    Sphinx: 8.2.3
    sphinx-autodoc-typehints: 3.1.0
    sphinxcontrib-applehelp: 2.0.0
    sphinxcontrib-blockdiag: 3.0.0
    sphinxcontrib-devhelp: 2.0.0
    sphinxcontrib-htmlhelp: 2.1.0
    sphinxcontrib-jsmath: 1.0.1
    sphinxcontrib-qthelp: 2.0.0
    sphinxcontrib-serializinghtml: 2.0.0
    stack-data: 0.6.3
    superqt: 0.7.1
    tables: 3.10.2
    tcia_utils: 1.5.1
    tifffile: 2025.3.13
    tinyarray: 1.2.4
    tornado: 6.5.1
    traitlets: 5.14.3
    typing_extensions: 4.14.1
    tzdata: 2025.2
    urllib3: 2.5.0
    wcwidth: 0.2.13
    webcolors: 24.11.1
    wheel: 0.45.1
    wheel-filename: 1.4.2
    widgetsnbextension: 4.0.14
    WMI: 1.5.1

[pett]

Looks like the user clicked several times on the "UniProt" link -- UniProt must have been slow to respond. Even doing so I cannot get this error to occur.