Code P0442 indicates you have a small leak in the evaporative emissions system.
You are not going damage anything by driving it, nor are you going to be left stranded somewhere by having this concern.
It is not serious unless you are out of warranty, then it might be expensive to fix. It could be as simple as a loose gas cap to repair.
If your car is still under warranty take it to the dealer and get it tested to pinpoint the cause of the leak and have it fixed.