Although im not exactly sure, it very well could be possible. Depending on how many are out depends on how much current. So if in lets say daisy chained strands equaling to 500 lights and 9 are out, it isnt going to do much harm, but if 200 are out, some major damage could be done to the other lights. But for the relatively short time they are in use, it should be fine. They should last for a few years yet before maor damage will occur.