Hi,

The error message you're encountering suggests that contract.wage might be None in some cases, causing the float() function to fail. To address this issue, you should check if contract.wage is not None before attempting to perform calculations with it. Here's how you can modify your code to handle this:

if contract.wage is not None and contract.wage > 33333: result = float(6396 + (contract.wage - 33333) * 0.25) else: # Handle the case when contract.wage is None or less than or equal to 33333 result = 0 # Or any other default value you want to assign 

Hope it helps