How bad is one hot chocolate everyday at the end of 18hr fast?

I have 18/6 fast/feed window and I have been drinking a hot chocolate on the 18th hour for the last two weeks. It's my only vice, and other than that I eat clean. I wonder if it's okay to incorporate into my diet permanently. My fasts start at 11:30pm and end at 6PM the following day.

Also having followed leangains for a few months and working out fasted, I once tried working out non-fasted (ate a sandwitch 2 hours prior), and it was terrible - very little strength and motivation. But drinking hot chocoate an hour before my workouts doesn't seem to impact my workout negatively.