Commit: fd2bdc07ca8e9b8e5f7c1e48058b9bfddbc607a0
Author: Sergey Sharybin
Date:   Thu Oct 8 21:06:09 2015 +0500
Branches: master
https://developer.blender.org/rBfd2bdc07ca8e9b8e5f7c1e48058b9bfddbc607a0

Fix crash loading modifiers with missing IDs

Was very visible with barcelona file from Cycles benchmark repository.

===================================================================

M       source/blender/blenloader/intern/readfile.c

===================================================================

diff --git a/source/blender/blenloader/intern/readfile.c 
b/source/blender/blenloader/intern/readfile.c
index b8bdbe5..2ce4a93 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -4596,7 +4596,7 @@ static void lib_link_modifiers__linkModifiers(
        FileData *fd = userData;
 
        *idpoin = newlibadr(fd, ob->id.lib, *idpoin);
-       if (cd_flag & IDWALK_USER) {
+       if (*idpoin != NULL && (cd_flag & IDWALK_USER) != 0) {
                (*idpoin)->us++;
        }
 }

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