diff --git a/pyproject.toml b/pyproject.toml
index aac814b..c471779 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "tabsim"
-version = "0.0.12"
+version = "0.0.13"
 license = {file = "LICENSE"}
 readme = "README.md"
 # dynamic = ["version", "readme"]
diff --git a/tabsim/scripts/sim_vis.py b/tabsim/scripts/sim_vis.py
index be95c0d..c530800 100644
--- a/tabsim/scripts/sim_vis.py
+++ b/tabsim/scripts/sim_vis.py
@@ -77,7 +77,6 @@ def main():
     rfi_amp = args.rfi_amp
     spacetrack_path = args.spacetrack
     config_path = Path(args.config_path)
-    save_path = Path(args.save_path)
 
     if not config_path.is_file():
         print(f"Error: config file not found: {config_path}", file=sys.stderr)
@@ -88,7 +87,9 @@ def main():
 
     sim_config = load_config(config_path, config_type="sim")
 
-    sim_config["output"]["path"] = save_path
+    if args.save_path:
+        save_path = Path(args.save_path)
+        sim_config["output"]["path"] = save_path
 
     if args.ra is not None:
         sim_config["observation"]["ra"] = args.ra