Object reference not set to an instance of an object error

I have the following code which is throwing an "object reference not set to an instance of an object error".  How can I change it to not give this exception?  The code is supposed to check for SecondaryWageAmount and if it's there, add it to PrimaryWageAmount otherwise just return PrimaryWageAmount

            decimal returnValue;
            returnValue = HasSecondary ?
                               PrimaryWageAmount + SecondaryWageAmount
                            : PrimaryWageAmount;
            return returnValue;

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What are HasSecondary, PrimaryWageAmount and SecondaryWageAmount?
At least one of them is null or is a property which uses a null object at some point. Which one?

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PSCTECHAuthor Commented:
Actally, I figured it out.  You are right  SecondaryWageAmount was erroneously getting set to null.  Thanks for the response
PSCTECHAuthor Commented:
Thanks for the quick response.  I appreciate it.
Are you certain that the error is happening on this section of code? Your exception... is it indicating that the error is on these lines?
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