diff --git a/python/evalica/gradio/__main__.py b/python/evalica/gradio/__main__.py
index a0eecfe..cd366ea 100755
--- a/python/evalica/gradio/__main__.py
+++ b/python/evalica/gradio/__main__.py
@@ -30,8 +30,8 @@
     import sys
     from pathlib import Path
 
-    if (pydub_spec := importlib.util.find_spec("pydub")) is not None:
-        if (pydub_origin := pydub_spec.origin) is not None:
+    if (pydub_spec := importlib.util.find_spec("pydub")) is not None \
+        and (pydub_origin := pydub_spec.origin) is not None:
             sys.path.append(str(Path(pydub_origin).parent))
 
     import gradio as gr