From 3252f18098d73a9e5c1efc9530b7ea8f78bdec49 Mon Sep 17 00:00:00 2001
From: Bjarne-55 <73470930+Bjarne-55@users.noreply.github.com>
Date: Thu, 17 Oct 2024 16:40:01 +0200
Subject: [PATCH] Add assert to prevent None Environment

---
 mushroom_rl/core/multiprocess_environment.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mushroom_rl/core/multiprocess_environment.py b/mushroom_rl/core/multiprocess_environment.py
index ce7633a9..6f566851 100644
--- a/mushroom_rl/core/multiprocess_environment.py
+++ b/mushroom_rl/core/multiprocess_environment.py
@@ -66,6 +66,7 @@ def __init__(self, env_class, *args, n_envs=-1, use_generator=False, **kwargs):
             **kwargs: keyword arguments to set to the constructor or to the generator;
 
         """
+        assert env_class is not None, "Environment class requires not installed module."
         assert n_envs > 1 or n_envs == -1
 
         if n_envs == -1: