From 49311a73b8ec4bbbf8ed1c12677545ca39c277cf Mon Sep 17 00:00:00 2001
From: Hans Goudey <h.goudey@me.com>
Date: Wed, 15 Dec 2021 15:00:20 -0600
Subject: Fix: Crash in nodes modifier with missing node group

We cannot depend on node->id being non-null for group nodes.
---
 source/blender/modifiers/intern/MOD_nodes.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/blender/modifiers/intern/MOD_nodes.cc b/source/blender/modifiers/intern/MOD_nodes.cc
index 211257597cb..ec6cbeb43bf 100644
--- a/source/blender/modifiers/intern/MOD_nodes.cc
+++ b/source/blender/modifiers/intern/MOD_nodes.cc
@@ -280,7 +280,7 @@ static bool check_tree_for_time_node(const bNodeTree &tree,
     }
     if (node->type == NODE_GROUP) {
       const bNodeTree *sub_tree = reinterpret_cast<const bNodeTree *>(node->id);
-      if (check_tree_for_time_node(*sub_tree, r_checked_trees)) {
+      if (sub_tree && check_tree_for_time_node(*sub_tree, r_checked_trees)) {
         return true;
       }
     }
-- 
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