From a5e1da0b92cd5ae45d1a87756a1f0827af5feecd Mon Sep 17 00:00:00 2001
From: pca006132 <jl@m-labs.hk>
Date: Sat, 5 Mar 2022 00:27:23 +0800
Subject: [PATCH] nac3artiq/demo/embedding_map: avoid key 0

Object key 0 is reserved for builtin exceptions.
---
 nac3artiq/demo/embedding_map.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nac3artiq/demo/embedding_map.py b/nac3artiq/demo/embedding_map.py
index 9f4b877a..74b9aa1a 100644
--- a/nac3artiq/demo/embedding_map.py
+++ b/nac3artiq/demo/embedding_map.py
@@ -33,7 +33,7 @@ class EmbeddingMap:
         obj_id = id(obj)
         if obj_id in self.object_inverse_map:
             return self.object_inverse_map[obj_id]
-        key = len(self.object_map)
+        key = len(self.object_map) + 1
         self.object_map[key] = obj
         self.object_inverse_map[obj_id] = key
         return key