1 files changed, 2 insertions, 0 deletions
diff --git a/Lib/ntpath.py b/Lib/ntpath.py
index cfb4606..9cc5ca7 100644
--- a/Lib/ntpath.py
+++ b/Lib/ntpath.py
@@ -81,6 +81,8 @@ def join(path, *paths):
         seps = '\\/'
         colon = ':'
     try:
+        if not paths:
+            path[:0] + sep  #23780: Ensure compatible data type even if p is null.
         result_drive, result_path = splitdrive(path)
         for p in paths:
             p_drive, p_path = splitdrive(p)