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Bug: 'cgc watch' incremental indexing failing with "AttributeError: 'NoneType' object has no attribute 'split'" #1272
Description
Hi, team cgc! I'm using main branch commit c235df7 and when cgc watch is observing a repo for file changes, when changes are detected in multiple files, all threads are failing with errors similar to the following:
...
Exception in thread Thread-145:
Traceback (most recent call last):
File "/Users/peter.junkoh/.pyenv/versions/3.14.4/lib/python3.14/threading.py", line 1082, in _bootstrap_inner
self._context.run(self.run)
~~~~~~~~~~~~~~~~~^^^^^^^^^^
File "/Users/peter.junkoh/.pyenv/versions/3.14.4/lib/python3.14/threading.py", line 1385, in run
self.function(*self.args, **self.kwargs)
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/peter.junkoh/Documents/repos/personal/CodeGraphContext/src/codegraphcontext/core/watcher.py", line 310, in <lambda>
self._debounce(event.src_path, lambda: self._handle_modification(event.src_path))
~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^
File "/Users/peter.junkoh/Documents/repos/personal/CodeGraphContext/src/codegraphcontext/core/watcher.py", line 264, in _handle_modification
self.graph_builder.link_inheritance(subset_file_data, self.imports_map)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/peter.junkoh/Documents/repos/personal/CodeGraphContext/src/codegraphcontext/tools/graph_builder.py", line 854, in link_inheritance
self._writer.write_decorated_by_links(build_decorated_by_links(all_file_data, imports_map))
~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/peter.junkoh/Documents/repos/personal/CodeGraphContext/src/codegraphcontext/tools/indexing/resolution/inheritance.py", line 365, in build_decorated_by_links
dec_path = _resolve_decorator_path(
dec_name, caller_file_path, local_names, local_imports, imports_map
)
File "/Users/peter.junkoh/Documents/repos/personal/CodeGraphContext/src/codegraphcontext/tools/indexing/resolution/inheritance.py", line 323, in _resolve_decorator_path
lookup = imported.split(".")[-1]
^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'split'
Environment:
- MacOS 26.5.1 Tahoe
- Apple Silicon M4 (MBP)
- Built
cgcfrom source
Activity
github-actions commentedon Jun 17, 2026
Hi! 👋 Join our CodeGraphContext Discord channel to collaborate: https://discord.gg/dR4QY32uYQ
Akshitha2912v commentedon Jun 17, 2026
Hi, I would like to work on this issue under GSSoC 2026. Please assign it to me.
Thank you!
MorningStar0709 commentedon Jun 20, 2026
Hi @PeterJunker, I've opened PR #1291 which addresses this issue.
Root cause: Several dict comprehensions that build
local_importscall.split()or.endswith()onimp["name"]without checking forNone. When tree-sitter parsers produce import entries with"name": None(e.g., certain relative/star/aliased import forms), this crashes withAttributeError.Fix summary:
imp.get("name")guards to all affected dict comprehensions ingraph_builder.py,inheritance.py, andcalls.py_resolve_decorator_pathagainstNoneimported values with fall-through toimports_maplookupfull_import_namefallback for decorator/metaclass resolution (Python imports havefull_import_namebut notsource)The fix also covers the related issue #1285 (decorator path crash).
Shashankss1205 commentedon Jul 25, 2026
Resolved: the watcher incremental-parse
NoneType.split()crash is fixed by import-name/source guards (commits 59d9172, 62dae1e). Closing.