Null Variable in Access Form

[HMeister]

I'm trying to insert the value from a form object into an Access table. In my sub, after first declaring the variable and then setting the variable to Forms!Formname!objectname, when the value is null, it causes an error. As a workaround, I placed the variable declaration inside a conditional statement, and this works for the data types except datetime and Boolean. Regardless of whether or not the variable is declared inside the conditional statement, the datatime gets set to 12:00 am and Boolean to false at runtime. I'd appreciate any suggestions you can offer.