InDesign Crashing when trying to add hyperlink to another document

I'm running the following code on the latest version of InDesign CC on Windows 7.

I'm trying to create a list of cross-references to a collection of pre-grepped TextFrames--myTextFrames--from across the documents of a book. The cross-reference text and link is meant to be added in the text frame whose contents are currently selected in the Index document--activeDoc.

The app crashes on line 49, at the hyperlink.add(). Any ideas why?

function main()
{
    var myBook = app.activeBook;
    var myDoc, myTextFrames, myDestinations, i;
    
    for (i = 1; i < myBook.bookContents.length; i++)
    {
        myDoc = app.open(File(myBook.bookContents.fullName), false);
        // ... getTextFrames() happens here
        myDestinations = createDestinations(myDoc, myTextFrames); 
        createHyperlinks(myDoc, myDestinations);    
        myDoc.close(SaveOptions.YES);
    }
}
// Create destinations
function createDestinations(myDoc, /* Array[TextFrame] */ myTextFrames)
{
    var i, myParagraph, myLinkName, myDestinations = [];
    
    for (i = 0; i < myTextFrames.length; i++)
    {
        myInsertionPoint = myTextFrames.paragraphs[0].insertionPoints.firstItem();
        myLinkName = myTextFrames.paragraphs[0].contents; 
        
        myDestinations.push(myDoc.paragraphDestinations.add(myInsertionPoint, {name: myLinkName}));
    }
    return myDestinations;
}
// Create hyperlinks
function createHyperlinks(myDoc, /* Array[paragraphDestination] */ myDestinations)
{
    var i, mySource, mySourceText, myParagraphDestination, myLink, myInsertionPoint;
    var xRefForm = myDoc.crossReferenceFormats.item('Full Paragraph');
    var activeDoc = app.activeDocument;
        
    for (i = 0; i < myDestinations.length; i++)
    {
        myInsertionPoint = app.selection[0].insertionPoints.lastItem();        
        mySource = activeDoc.crossReferenceSources.add(myInsertionPoint, xRefForm);
        myParagraphDestination = myDoc.paragraphDestinations.itemByName(myDestinations.name);
        myLink = activeDoc.hyperlinks.add(mySource, myParagraphDestination, {name: myDestinations.name});
    }
}

Thank you,

Oren