title: Suppress Report Footer if Field is Null
body: <p>I'm trying to suppress the report footer is a signature blob field is null using this in the section expert, details here:</p>
  
  <p><img src="https://i.stack.imgur.com/nhprY.png" alt="Crystal Reports Script"></p>
  
  <p>However when I run the code checker it says the field name is not known.</p>