NSXMLParser: EXC_BAD_ACCESS error

Question

NSXMLParser: EXC_BAD_ACCESS error

I'm a newbie to Swift, not a regular coder, so I'm sorry, chances are I'm missing something obvious!

I have an NSXMLParser class that gives me an EXC_BAD_ACCESS error when I try to add a result item to an array.

I believe (using the Xcode debugger) that I have a valid instance of Security (my result class).

My result array is empty and I am trying to add the first item when I get an error.

Class below:

class YahooXMLParser: NSXMLParser, NSXMLParserDelegate{

    var results: [Security] = []
    var parser: NSXMLParser = NSXMLParser()

    var xSecurityTicker: String = String()
    var xPurchasePrice: String = String()
    var xLatestPrice: String = String()
    var xStopLossPrice: String = String()
    var xChange: String = String()
    var xProfitPercent: String = String()
    var eName: String = String()

    func parseYahoo(url: NSURL) ->[Security]{
        parser = NSXMLParser(contentsOfURL: url)!
        parser.delegate = self
        parser.parse()
        return results
    }

    // NSXMLPArser Delegate functions

    func parser(parser: NSXMLParser, didStartElement elementName: String, namespaceURI: String?, qualifiedName qName: String?, attributes attributeDict: [NSObject : AnyObject]) {
        eName = elementName
        if elementName == "col0" {
            xSecurityTicker = String()
        }
        if elementName == "col1" {
            xLatestPrice = String()
        }
        if elementName == "col4" {
            xChange = String()
        }
    }

    func parser(parser: NSXMLParser, foundCharacters string: String?) {
        let data = string!.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
        if (!data.isEmpty) {
            if eName == "col0" {
                xSecurityTicker += data
            } else if eName == "col1" {
                xLatestPrice += data
            } else if eName == "col4" {
                xChange += data
            }
        }
    }

    func parser(parser: NSXMLParser, didEndElement elementName: String, namespaceURI: String?, qualifiedName qName: String?) {
        if elementName == "row" {
            let newSecurity = Security(ticker: xSecurityTicker,
                latest: NSString(string: xLatestPrice).floatValue,
                change: NSString(string: xChange).floatValue)

            results.append(newSecurity)
        }

    }

}