sequence.clone() not returning the sequence?

Hello,

The following script throws the error "undefined is not an object" in version 13.0:

var theSequence = app.project.activeSequence;
var newSequence = theSequence.clone();
newSequence.clone();

The documentation says that it should "return a Sequence if successful, 0 if not."

My workaround is to guess the new sequence name then search all sequences in the project for that name.  Not really ideal, though it works for now.

var theSequence = app.project.activeSequence;
theSequence.clone();
var targetName = theSequence.name + " Copy";  //sets targetName to the expected name of the cloned Sequence  
var newSequence = findSequence(targetName);
newSequence.clone();
function findSequence(seqName)
{ 
    var targetSequence;
    
    var allSequences = app.project.sequences;
    var sequenceCount = allSequences.numSequences;
    
    for(var i = 0; i < sequenceCount; i++)
    {
        if(allSequences.name == seqName)
        {
        targetSequence = allSequences;
        i = sequenceCount;
        }
    }    
        return targetSequence;
}

Please let me know if I'm just using sequence.clone() (or javascript) incorrectly! 

Thanks!