Worked on the huggingface/diffusers repository to enhance backend stability by implementing a graceful fallback mechanism for external attention backends. Addressed a critical bug where ABI-mismatch imports could cause crashes by introducing try-except guarded imports for various attention modules, such as flash_attn and xformers. When an import failed, the system logged a warning and defaulted to native PyTorch scaled_dot_product_attention, ensuring uninterrupted operation. Centralized logging was added at the module level, and exception handling was updated to include RuntimeError, improving maintainability. This work leveraged Python, PyTorch, and backend development skills to improve compatibility and user experience across multiple environments.