From 20eaa1b1b033386a9b3098ad00c02cd3c5da047f Mon Sep 17 00:00:00 2001
From: Jacques Lucke <jacques@blender.org>
Date: Fri, 18 Jul 2025 16:21:13 +0200
Subject: [PATCH] Fix: Attributes: missing null check in when accessing
 attribute for write

---
 source/blender/blenkernel/intern/attribute_storage.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/source/blender/blenkernel/intern/attribute_storage.cc b/source/blender/blenkernel/intern/attribute_storage.cc
index 98818a760b5..c6d0ff4cbb4 100644
--- a/source/blender/blenkernel/intern/attribute_storage.cc
+++ b/source/blender/blenkernel/intern/attribute_storage.cc
@@ -165,6 +165,10 @@ AttrStorageType Attribute::storage_type() const
 Attribute::DataVariant &Attribute::data_for_write()
 {
   if (auto *data = std::get_if<Attribute::ArrayData>(&data_)) {
+    if (!data->sharing_info) {
+      BLI_assert(data->size == 0);
+      return data_;
+    }
     if (data->sharing_info->is_mutable()) {
       data->sharing_info->tag_ensured_mutable();
       return data_;