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This commit fixes issue #3929 where setting 'context: None' in a YAML task configuration would cause errors. Changes: 1. Updated _map_task_variables in crew_base.py to explicitly handle the 'context' key when present in task_info: - Preserves explicit None values from YAML - Preserves empty list [] from YAML - Resolves non-empty lists to Task instances as before 2. Updated process_config in utilities/config.py to allow None values from config to override the NOT_SPECIFIED sentinel: - Changed condition to only skip override when current value is not None AND not NOT_SPECIFIED - This preserves the semantic distinction between 'unspecified' (NOT_SPECIFIED) and 'explicitly none' (None) 3. Added comprehensive unit tests: - test_config.py: Tests for process_config handling None with NOT_SPECIFIED sentinel - test_crew_base_context_none.py: Tests for _map_task_variables handling context: None, context: [], and context: [tasks] The fix ensures that when users set 'context: None' in YAML, it is properly preserved as None in the Task instance, rather than being ignored or causing errors. Co-Authored-By: João <joao@crewai.com>