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When CrewAI is initialized from a non-main thread (e.g., in Streamlit, Flask, Django, Jupyter), the telemetry module was printing multiple ValueError tracebacks for each signal handler registration attempt. This fix adds a proactive main thread check in _register_shutdown_handlers() before attempting signal registration. If not in the main thread, a debug message is logged and signal handler registration is skipped. Fixes #4289 Co-Authored-By: João <joao@crewai.com>