@Crossover2000 Well... From my experience - don't force it. If you feel like you can't come up with anything at the time, then don't be afraid of giving yourself a break. Even for a few days. If your mind will be exhausted, it will be clearly seen in your story. Sometimes I forgot about that rule myself, but I try to remember it.
Also sometimes, when you're not mentally exhausted, but don't know what to write, you can use something I call "sketch method".
It's simple - you write the chapter in the simpliest form possible. JFor example just character statements and simple actions. (He turned around; She glared). Then you come back there some times later, read what you wrote and start adding some more details, about characters' emotions and background.
I myself am a beginner as a writer, so I don't really know what can I say as an advice, but I hope it will be useful!