diff --git a/config/scripts/camera_name_date b/config/scripts/camera_name_date
index eed88e3..0001baa 100755
--- a/config/scripts/camera_name_date
+++ b/config/scripts/camera_name_date
@@ -67,8 +67,8 @@ def main(args: argparse.Namespace) -> None:
             new_filename = (
                 f"{m['Y']}-{m['M']}-{m['D']}_"
                 f"{m['h']}-{m['m']}-{m['s']}"
-                f"{m.get('dup', '')}"
-                f"{m.get('spec', '')}"
+                f"{m.get('dup') or ''}"
+                f"{m.get('spec') or ''}"
                 f"{args.suffix}"
                 f".{m['ext']}"
             )