Ok, something silly here. I'm getting

Cannot read property "restLogin" from null

, I have a session variable that I look for, which I expect to be empty at times. So when it's not there, I test this way

if (sessionVar == null)

-- but that doesn't work. So why did my error message just tell me that the variable I'm looking is null? It's like the error I get back, and what's actually going on are two different things.