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Fix: KickoffTaskOutputsSQLiteStorage crashes on list values and NULL fields - #7814
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…SQLiteStorage update() only JSON-encoded values that were a dict, so passing a list (e.g. output=[...]) raised sqlite3.ProgrammingError since sqlite3 can't bind Python lists directly. Encode lists the same way as dicts. load() unconditionally called json.loads() on the output/inputs columns. If either was NULL (e.g. after update(..., output=None)), this raised an uncaught TypeError that broke load() for the whole table. Skip json.loads() when the column is NULL.
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ChangesKickoff task output storage
Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The storage change covers the reported value and legacy-data cases; no material merge risk is evident. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The change is narrowly scoped, but malformed saved records can now reach replay after mutable state restoration has begun. Existing identity checks and write transactions remain intact. No new privilege grant is established. Retained concerns
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update() only JSON-encoded dict/list values, so a scalar (e.g. a plain string or int) written to the output/inputs columns went in unencoded. load() unconditionally json.loads()s those columns, so round-tripping a scalar through update()/load() raised json.JSONDecodeError. Encode every non-None value written to a JSON column, keyed off a _JSON_COLUMNS set rather than the value's type, so plain columns (task_key, expected_output, task_index, was_replayed) are unaffected. Also make load() tolerant of a row written by the pre-fix update() that left a JSON column unencoded, instead of crashing the whole table read on one malformed legacy row.
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@lib/crewai/src/crewai/memory/storage/kickoff_task_outputs_storage.py:
- Around line 187-190: Update _decode_json_column to catch UnicodeDecodeError
alongside JSONDecodeError and TypeError, so invalid UTF-8 legacy BLOB values use
the existing raw-value fallback.
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Summary
Fixes #7746.
KickoffTaskOutputsSQLiteStoragehas two related bugs inlib/crewai/src/crewai/memory/storage/kickoff_task_outputs_storage.py:update()only JSON-encodes values that are adict:Passing a
list(e.g.update(0, output=["a", "b"])) skips encoding, andsqlite3cannot bind a Pythonlistdirectly, so this raisessqlite3.ProgrammingError: Error binding parameter: type 'list' is not supported.load()unconditionally callsjson.loads()on theoutput/inputscolumns. If either isNULLin the database (e.g. afterupdate(0, output=None)), this raisesTypeError: the JSON object must be str, bytes or bytearray, not NoneType, which is not caught by the surroundingexcept sqlite3.Error, so it propagates unhandled and breaksload()for the entire table.Fix
update(): encodelistvalues the same way asdictvalues (isinstance(value, (dict, list))).load(): only calljson.loads()when the column value isn'tNone, otherwise storeNone.Test plan
test_update_accepts_list_values: updates a row'soutputwith a list and asserts it round-trips correctly.test_load_handles_null_output_and_inputs: setsoutput/inputstoNoneviaupdateand assertsload()returnsNonefor those fields instead of raising.uv run pytest tests/storage/test_kickoff_task_outputs_storage.py -v— 5 passed.Note
Low Risk
Localized persistence-layer fix with backward-compatible reads; no auth or API surface changes, though callers may now see raw legacy values instead of crashes.
Overview
Fixes kickoff task output SQLite round-tripping so
update()/load()no longer crash on lists,NULL, scalars, or legacy bad rows.update()now treatsoutputandinputsas JSON columns via_JSON_COLUMNS: any non-Nonevalue isjson.dumps’d (not only dicts), andNoneis stored as SQLNULL. That fixes sqlite binding errors for lists and decode failures when scalars were written unencoded.load()decodes those columns through_decode_json_column, which returnsNonefor SQLNULLand falls back to the raw value (with a warning) when JSON parsing fails—covering pre-fix unencoded strings and invalid UTF-8 blobs so one bad row does not break the whole table.Adds focused tests for list/
NULL/scalar updates, legacy unencoded JSON, and non-UTF-8 column data.Reviewed by Cursor Bugbot for commit bf2632f. Bugbot is set up for automated code reviews on this repo. Configure here.