bokeh callback key error

There is some kind of KeyError that occurs on a Bokeh plot callback. This happens when you create a plot or two. The error does not crash the app but it happens every time and outputs a loong traceback. There are also no such comm messages that I'm not sure where they are coming from or if they're related.

Exception ignored in: <function Widget.__del__ at 0x16f519bc0>
Traceback (most recent call last):
  File "/Users/brian/anaconda3/envs/vspy12/lib/python3.12/site-packages/ipywidgets/widgets/widget.py", line 516, in __del__
    self.close()
  File "/Users/brian/anaconda3/envs/vspy12/lib/python3.12/site-packages/jupyter_bokeh/widgets.py", line 92, in close
    self._document.remove_on_change(self)
  File "/Users/brian/anaconda3/envs/vspy12/lib/python3.12/site-packages/bokeh/document/document.py", line 592, in remove_on_change
    self.callbacks.remove_on_change(*callbacks)
  File "/Users/brian/anaconda3/envs/vspy12/lib/python3.12/site-packages/bokeh/document/callbacks.py", line 331, in remove_on_change
    del self._change_callbacks[callback]
        ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
KeyError: BokehModel(render_bundle={'docs_json': {'74e9a707-b102-477c-b7ea-df83d3935c93': {'version': '3.6.3', 'title': 'Bokeh Application', 'roots': [{'type': 'object', 'name': 'Plot', 'id': 'p1121', 'attributes': {'name': '0', 'subscribed_events': {'type': 'set', 'entries': ['reset']}, 

Full traceback

No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: 40f6c61ea7fd453786458fe239e7a868
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
No such comm: a65e7f69bd424c879b0deb94ef3705ae
Exception ignored in: <function Widget.__del__ at 0x16f519bc0>
Traceback (most recent call last):
  File "/Users/brian/anaconda3/envs/vspy12/lib/python3.12/site-packages/ipywidgets/widgets/widget.py", line 516, in __del__
    self.close()
  File "/Users/brian/anaconda3/envs/vspy12/lib/python3.12/site-packages/jupyter_bokeh/widgets.py", line 92, in close
    self._document.remove_on_change(self)
  File "/Users/brian/anaconda3/envs/vspy12/lib/python3.12/site-packages/bokeh/document/document.py", line 592, in remove_on_change
    self.callbacks.remove_on_change(*callbacks)
  File "/Users/brian/anaconda3/envs/vspy12/lib/python3.12/site-packages/bokeh/document/callbacks.py", line 331, in remove_on_change
    del self._change_callbacks[callback]
        ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
KeyError: BokehModel(render_bundle={'docs_json': {'74e9a707-b102-477c-b7ea-df83d3935c93': {'version': '3.6.3', 'title': 'Bokeh Application', 'roots': [{'type': 'object', 'name': 'Plot', 'id': 'p1121', 'attributes': {'name': '0', 'subscribed_events': {'type': 'set', 'entries': ['reset']}, 'context_menu': {'type': 'object', 'name': 'Menu', 'id': 'p1118', 'attributes': {'styles': {'type': 'map', 'entries': [('color', 'black'), ('font-size', '16px')]}, 'items': [{'type': 'object', 'name': 'ActionItem', 'id': 'p1128', 'attributes': {'name': 'menu-clear', 'label': 'Clear selection', 'disabled': True, 'action': {'type': 'object', 'name': 'CustomJS', 'id': 'p1177', 'attributes': {'args': {'type': 'map', 'entries': [('source', {'type': 'object', 'name': 'ColumnDataSource', 'id': 'p1115', 'attributes': {'selected': {'type': 'object', 'name': 'Selection', 'id': 'p1116', 'attributes': {'indices': [], 'line_indices': []}}, 'selection_policy': {'type': 'object', 'name': 'UnionRenderers', 'id': 'p1117'}, 'data': {'type': 'map', 'entries': [('centers', {'type': 'ndarray', 'array': {'type': 'bytes', 'data': 'ZsbZSxkAIkATx8ITCwA7QHpVzMAEgEZAake39wOAT0CtHFGXAUBUQKWVxjIBwFhAnQ48zgBAXUDKw9g0AOBgQEaAkwIAIGNAwjxO0P9fZUA++Qie/59nQLq1w2v/32lANnJ+Of8fbECyLjkH/19uQJf1eWr/T3BA1VNXUf9vcUATsjQ4/49yQFEQEh//r3NAj27vBf/PdEDNzMzs/u91QA=='}, 'shape': [20], 'dtype': 'float64', 'order': 'little'}), ('left', {'type': 'ndarray', 'array': {'type': 'bytes', 'data': 'AAAAYHPlKj9mFiDZCwAyQGY+wx8FAEJAmXH2UgQAS0Bm0hTDAQBSQABsrlwBgFZAmQVI9gAAW0Ayn+GPAIBfQGacvRQAAGJAM2mK4f8/ZEAANleu/39mQMwCJHv/v2hAmc/wR///akBmnL0U/z9tQDJpiuH+f29AAJsrV//fcEBmAZI9//9xQMxn+CP/H3NAM85eCv8/dECZNMXw/l91QA=='}, 'shape': [20], 'dtype': 'float64', 'order': 'little'}), ('right', {'type': 'ndarray', 'array': {'type': 'bytes', 'data': 'ZhYg2QsAMkBmPsMfBQBCQJlx9lIEAEtAZtIUwwEAUkAAbK5cAYBWQJkFSPYAAFtAMp/hjwCAX0BmnL0UAABiQDNpiuH/P2RAADZXrv9/ZkDMAiR7/79oQJnP8Ef//2pAZpy9FP8/bUAyaYrh/n9vQACbK1f/33BAZgGSPf//cUDMZ/gj/x9zQDPOXgr/P3RAmTTF8P5fdUAAmyvX/n92QA=='}, 'shape': [20], 'dtype': 'float64', 'order': 'little'}), ('y', {'type': 'ndarray', 'array': {'type': 'bytes', 'data': 'daoAAEOVAACRnwAACvYAANVHAQCFjwEAPFMBAOUpAQB77AAAF9UAADylAAAptQAAhskAAEshAQA9lgEAmi4CAJvAAQAi2wAAAbAAANyVAAA='}, 'shape': [20], 'dtype': 'int32', 'order': 'little'})]}}})]}, 'code': '\n             source.selected.indices = [];\n             source.selected.indices.change.emit();\n             '}}}}, {'type': 'object', 'name': 'ActionItem', 'id': 'p1130', 'attributes': {'name': 'reset-view', 'label': 'Reset plot', 'action': {'type': 'object', 'name': 'CustomJS', 'id': 'p1129', 'attributes': {'args': {'type': 'map', 'entries': [('p', {'id': 'p1121'})]}, 'code': 'p.reset.emit()'}}}}]}}, 'height': 360, 'width_policy': 'max', 'height_policy': 'fixed', 'x_range': {'type': 'object', 'name': 'DataRange1d', 'id': 'p1119'}, 'y_range': {'type': 'object', 'name': 'DataRange1d', 'id': 'p1120', 'attributes': {'start': 0}}, 'x_scale': {'type': 'object', 'name': 'LinearScale', 'id': 'p1124'}, 'y_scale': {'type': 'object', 'name': 'LinearScale', 'id': 'p1125'}, 'extra_x_ranges': {'type': 'map', 'entries': [('lin', {'type': 'object', 'name': 'DataRange1d', 'id': 'p1135'}), ('log', {'type': 'object', 'name': 'DataRange1d', 'id': 'p1136'})]}, 'extra_y_ranges': {'type': 'map', 'entries': [('lin', {'type': 'object', 'name': 'DataRange1d', 'id': 'p1137'}), ('log', {'type': 'object', 'name': 'DataRange1d', 'id': 'p1138'})]}, 'extra_x_scales': {'type': 'map', 'entries': [('lin', {'type': 'object', 'name': 'LinearScale', 'id': 'p1131'}), ('log', {'type': 'object', 'name': 'LogScale', 'id': 'p1132'})]}, 'extra_y_scales': {'type': 'map', 'entries': [('lin', {'type': 'object', 'name': 'LinearScale', 'id': 'p1133'}), ('log', {'type': 'object', 'name': 'LogScale', 'id': 'p1134'})]}, 'title': {'type': 'object', 'name': 'Title', 'id': 'p1126'}, 'renderers': [{'type': 'object', 'name': 'GlyphRenderer', 'id': 'p1150', 'attributes': {'data_source': {'id': 'p1115'}, 'view': {'type': 'object', 'name': 'CDSView', 'id': 'p1151', 'attributes': {'filter': {'type': 'object', 'name': 'AllIndices', 'id': 'p1152'}}}, 'glyph': {'type': 'object', 'name': 'Quad', 'id': 'p1149', 'attributes': {'left': {'type': 'field', 'field': 'left'}, 'right': {'type': 'field', 'field': 'right'}, 'bottom': {'type': 'value', 'value': 0}, 'top': {'type': 'field', 'field': 'y'}, 'fill_color': {'type': 'value', 'value': 'skyblue'}}}}}], 'toolbar': {'type': 'object', 'name': 'Toolbar', 'id': 'p1127', 'attributes': {'autohide': True, 'tools': [{'type': 'object', 'name': 'PanTool', 'id': 'p1154'}, {'type': 'object', 'name': 'BoxZoomTool', 'id': 'p1155', 'attributes': {'overlay': {'type': 'object', 'name': 'BoxAnnotation', 'id': 'p1156', 'attributes': {'syncable': False, 'line_color': 'black', 'line_alpha': 1.0, 'line_width': 2, 'line_dash': [4, 4], 'fill_color': 'lightgrey', 'fill_alpha': 0.5, 'level': 'overlay', 'visible': False, 'left': {'type': 'number', 'value': 'nan'}, 'right': {'type': 'number', 'value': 'nan'}, 'top': {'type': 'number', 'value': 'nan'}, 'bottom': {'type': 'number', 'value': 'nan'}, 'left_units': 'canvas', 'right_units': 'canvas', 'top_units': 'canvas', 'bottom_units': 'canvas', 'handles': {'type': 'object', 'name': 'BoxInteractionHandles', 'id': 'p1162', 'attributes': {'all': {'type': 'object', 'name': 'AreaVisuals', 'id': 'p1161', 'attributes': {'fill_color': 'white', 'hover_fill_color': 'lightgray'}}}}}}}}, {'type': 'object', 'name': 'BoxSelectTool', 'id': 'p1164', 'attributes': {'renderers': 'auto', 'overlay': {'type': 'object', 'name': 'BoxAnnotation', 'id': 'p1165', 'attributes': {'syncable': False, 'line_color': 'black', 'line_alpha': 1.0, 'line_width': 2, 'line_dash': [4, 4], 'fill_color': 'lightgrey', 'fill_alpha': 0.5, 'level': 'overlay', 'visible': False, 'left': {'type': 'number', 'value': 'nan'}, 'right': {'type': 'number', 'value': 'nan'}, 'top': {'type': 'number', 'value': 'nan'}, 'bottom': {'type': 'number', 'value': 'nan'}, 'editable': True, 'handles': {'type': 'object', 'name': 'BoxInteractionHandles', 'id': 'p1171', 'attributes': {'all': {'type': 'object', 'name': 'AreaVisuals', 'id': 'p1170', 'attributes': {'fill_color': 'white', 'hover_fill_color': 'lightgray'}}}}}}}}, {'type': 'object', 'name': 'LassoSelectTool', 'id': 'p1172', 'attributes': {'renderers': 'auto', 'continuous': False, 'overlay': {'type': 'object', 'name': 'PolyAnnotation', 'id': 'p1173', 'attributes': {'syncable': False, 'level': 'overlay', 'visible': False, 'xs': [], 'ys': [], 'editable': True, 'line_color': 'black', 'line_alpha': 1.0, 'line_width': 2, 'line_dash': [4, 4], 'fill_color': 'lightgrey', 'fill_alpha': 0.5}}}}, {'type': 'object', 'name': 'HoverTool', 'id': 'p1153', 'attributes': {'visible': False, 'renderers': 'auto', 'tooltips': '\n    <div>\n        <div style="display: table; border-spacing: 2px;">\n            \n            <div style="display: table-row">\n                <div style="display: table-cell; color: #0D47A1; text-align: right;">\n                    ra:\n                </div>\n                <div style="display: table-cell;">\n                    @centers{0}\n                </div>\n            </div>\n        \n            <div style="display: table-row">\n                <div style="display: table-cell; color: #0D47A1; text-align: right;">\n                    count(ra):\n                </div>\n                <div style="display: table-cell;">\n                    @y{0}\n                </div>\n            </div>\n        \n        </div>\n    </div>\n    <style>\n        div.bk-tooltip-content > div > div:not(:first-child) {\n            display:none !important;\n        }\n    </style>', 'formatters': {'type': 'map', 'entries': [('@centers', {'type': 'object', 'name': 'CustomJSHover', 'id': 'p1176', 'attributes': {'code': 'return value.toFixed(4);'}})]}, 'point_policy': 'follow_mouse'}}, {'type': 'object', 'name': 'WheelZoomTool', 'id': 'p1163', 'attributes': {'renderers': 'auto'}}, {'type': 'object', 'name': 'SaveTool', 'id': 'p1175'}, {'type': 'object', 'name': 'ResetTool', 'id': 'p1174'}], 'active_scroll': {'id': 'p1163'}}}, 'toolbar_location': 'above', 'left': [{'type': 'object', 'name': 'LinearAxis', 'id': 'p1143', 'attributes': {'ticker': {'type': 'object', 'name': 'BasicTicker', 'id': 'p1144', 'attributes': {'mantissas': [1, 2, 5]}}, 'formatter': {'type': 'object', 'name': 'BasicTickFormatter', 'id': 'p1145'}, 'axis_label': 'count(ra)', 'major_label_policy': {'type': 'object', 'name': 'AllLabels', 'id': 'p1146'}}}], 'below': [{'type': 'object', 'name': 'LinearAxis', 'id': 'p1139', 'attributes': {'ticker': {'type': 'object', 'name': 'BasicTicker', 'id': 'p1140', 'attributes': {'mantissas': [1, 2, 5]}}, 'formatter': {'type': 'object', 'name': 'BasicTickFormatter', 'id': 'p1141'}, 'axis_label': 'ra', 'major_label_policy': {'type': 'object', 'name': 'AllLabels', 'id': 'p1142'}}}], 'center': [{'type': 'object', 'name': 'Grid', 'id': 'p1147', 'attributes': {'ticker': {'id': 'p1140'}}}, {'type': 'object', 'name': 'Grid', 'id': 'p1148', 'attributes': {'dimension': 1, 'ticker': {'id': 'p1144'}}}], 'lod_factor': 20000, 'lod_threshold': 1000, 'lod_timeout': 10000, 'output_backend': 'webgl', 'reset_policy': 'event_only'}}]}}, 'render_items': [{'docid': '74e9a707-b102-477c-b7ea-df83d3935c93', 'roots': {'p1121': 'dca457ca-14de-429b-9352-840f29af48a9'}, 'root_ids': ['p1121']}], 'div': '\n  <div id="dca457ca-14de-429b-9352-840f29af48a9" data-root-id="p1121" style="display: contents;"></div>\n'})

Start by reproducing the callback with one or two plots, then inspect jupyter_bokeh/widgets.py around Widget.close and Bokeh's document callbacks where remove_on_change is called. Done means the callback no longer emits the KeyError traceback or unexplained “No such comm” messages; the issue names no repository test to run.