diff --git a/yt_dlp/YoutubeDL.py b/yt_dlp/YoutubeDL.py
index 764baf3a0..178c5b951 100644
--- a/yt_dlp/YoutubeDL.py
+++ b/yt_dlp/YoutubeDL.py
@@ -1323,7 +1323,7 @@ class YoutubeDL:
         elif (sys.platform != 'win32' and not self.params.get('restrictfilenames')
                 and self.params.get('windowsfilenames') is False):
             def sanitize(key, value):
-                return value.replace('/', '\u29F8').replace('\0', '')
+                return str(value).replace('/', '\u29F8').replace('\0', '')
         else:
             def sanitize(key, value):
                 return filename_sanitizer(key, value, restricted=self.params.get('restrictfilenames'))