From 9c0f11344e77eb4062ddb08502317d287cce4bc8 Mon Sep 17 00:00:00 2001
From: Philipp Oeser <info@graphics-engineer.com>
Date: Tue, 10 Aug 2021 10:27:57 +0200
Subject: [PATCH] Fix T90564: Crash when linking 2 node inputs

Caused by {rB37570a73170e}.

Above commit wasnt taking into account that at this point the link could
still be NULL.

Maniphest Tasks: T90564

Differential Revision: https://developer.blender.org/D12180
---
 source/blender/blenkernel/intern/node.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/blender/blenkernel/intern/node.cc b/source/blender/blenkernel/intern/node.cc
index 4aec5a9e667..1bf95369794 100644
--- a/source/blender/blenkernel/intern/node.cc
+++ b/source/blender/blenkernel/intern/node.cc
@@ -2364,7 +2364,7 @@ bNodeLink *nodeAddLink(
     ntree->update |= NTREE_UPDATE_LINKS;
   }
 
-  if (link->tosock->flag & SOCK_MULTI_INPUT) {
+  if (link != nullptr && link->tosock->flag & SOCK_MULTI_INPUT) {
     link->multi_input_socket_index = node_count_links(ntree, link->tosock) - 1;
   }