This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Are you sure you're getting the NPE in the for loop? If anything, I would expect an NPE way back on Line 4 before you'd get one on Line 10. Is that a complete listing or did you omit some code in between Line 4 and Line 10?