The quick and dirty way (it looks like this is an asp page or something?) is to do:
strStatement = trim("" & rst!STATEMENT)
Then check strStatement for "". Again--this is the quick & dirty way. Now, I'm well aware of the significant difference between Null and "", and don't want to start that thread here, but in a general sense, doing the above will avoid that error and give you the easy ability to get the code going.
If your db field makes a distinction between Null and "", then that's a new thread.
--Jim