Fix invalid variable reference.

diff --git a/ledger.py b/ledger.py
index b3373ba7f88d45707288d931662c7eca2201056e..1b3aa273dbaa3fb1908da8824212c191297cae36 100755 (executable)
--- a/ledger.py
+++ b/ledger.py
@@ -428,7 +428,7 @@ class Handler(PlomHttpHandler):
             id_ = self.server.move_booking(id_, dir_ == 'up')
         elif action == 'copy':
             id_ = self.server.copy_booking(id_, dir_ == 'to_end')
-        return Path(self.path).joinpath(f'#{id}')
+        return Path(self.path).joinpath(f'#{id_}')
 
     def do_GET(self) -> None:
         """"Route GET requests to respective handlers."""