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Fixes #3696 When context: None is specified in YAML, yaml.safe_load() converts it to the string 'None' instead of Python's None object. The code was attempting to iterate over this string character by character, causing KeyError: 'N' when trying to look up task names. Changes: - Added isinstance(context_list, list) check in crew_base.py before iterating context_list to handle YAML's conversion of None to string - Added test case test_task_with_none_context_from_yaml to verify tasks can be configured with context: None without errors - Added test YAML configurations in tests/config_none_context/ to reproduce and verify the fix The fix ensures that only actual list values are processed, allowing None and other non-list values to pass through without causing errors. Co-Authored-By: João <joao@crewai.com>