diff --git a/rarpar.py b/rarpar.py
index 189b0c9..ced194a 100644
--- a/rarpar.py
+++ b/rarpar.py
@@ -376,7 +376,9 @@ def rarpar(
     date = time.strftime('%Y-%m-%d')
     timestamp = time.strftime('%Y-%m-%d_%H-%M-%S')
 
-    basename = re.sub(r'\.rar$', '', basename)
+    if basename is not None:
+        basename = re.sub(r'\.rar$', '', basename)
+
     if not basename:
         basename = f'{path.basename} ({timestamp})'
     else: