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code with patel on Instagram: "🧠 python function mistake that crashes your code ⚠️ can you find the error? ❌ Error raised: TypeError: unsupported operand type(s) for +: 'NoneType' and 'int' 👉 reason: the function does not return anything, so result becomes None and None + 5 is not allowed in python. ✅ fix: Copy code Python def add(a, b): return a + b this mistake is very common in: python beginners function handling backend development interview questions web development logic 💬 comment “fix”