No rendering/headless mode available?

Hi, is there a way to run the soft learning code in a headless mode without needing to render to a display? Currently, when it keeps hanging for me in the same spot. It appears to be hanging on line 151 multiworld/envs/mujoco/mujoco_env.py, which says viewer = mujoco_py.MjRenderContextOffscreen(sim, device_id=self.device_id). 