diff --git a/pypots/base.py b/pypots/base.py
index bb0a27e1..e444ec24 100644
--- a/pypots/base.py
+++ b/pypots/base.py
@@ -291,6 +291,7 @@ def save(
                     f"❌ File {saving_path} exists. Saving operation aborted. "
                     f"Use the arg `overwrite=True` to force overwrite."
                 )
+                return
 
         try:
             create_dir_if_not_exist(saving_dir)
diff --git a/requirements/conda_env.yml b/requirements/conda_env.yml
index 39c03e27..5ffb13b1 100644
--- a/requirements/conda_env.yml
+++ b/requirements/conda_env.yml
@@ -22,8 +22,5 @@ dependencies:
     - conda-forge::pygrinder >=0.6.4
     - conda-forge::tsdb >=0.6.1
     - conda-forge::benchpots >=0.3
+    - conda-forge::ai4ts
     - pytorch::pytorch >=1.10.0
-
-    - pip:
-        # not published on conda-forge yet
-        - ai4ts
\ No newline at end of file