From cd073275848e2b775289db431c7febda9253ed5e Mon Sep 17 00:00:00 2001
From: Bastien Montagne <bastien@blender.org>
Date: Fri, 26 Jul 2024 15:26:36 +0200
Subject: [PATCH] BLO write: Avoid double lookup in already added blocks
 addresses.

---
 source/blender/blenloader/intern/writefile.cc | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/source/blender/blenloader/intern/writefile.cc b/source/blender/blenloader/intern/writefile.cc
index 37857dd1798..73a75b129e8 100644
--- a/source/blender/blenloader/intern/writefile.cc
+++ b/source/blender/blenloader/intern/writefile.cc
@@ -700,13 +700,12 @@ static bool write_at_address_validate(WriteData *wd, int filecode, const void *a
   }
 
   if (wd->is_writing_id && filecode == BLO_CODE_DATA) {
-    if (wd->validation_data.per_id_addresses_set.contains(address)) {
+    if (!wd->validation_data.per_id_addresses_set.add(address)) {
       CLOG_ERROR(&LOG,
                  "Same identifier (old address) used several times for a same ID, skipping this "
                  "block to avoid critical corruption of the Blender file.");
       return false;
     }
-    wd->validation_data.per_id_addresses_set.add(address);
   }
   return true;
 }