Don't crash when creating a new var in a module via Debugger.evaluateOnCallFrame
{
    className : EvalError
    description : EvalError: Identifier 'test' cannot be declared with 'var' in current evaluation scope, consider trying 'let' instead     at eval (eval at foo (module1:2:48), <anonymous>:1:1)     at foo (module1:2:48)     at module1:2:60
    objectId : <objectId>
    subtype : error
    type : object
}
