Fix several undefined-behaviour-sanitizer warnings

Reviewers: brecht

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D4222

1 files changed, 15 insertions, 9 deletions

diff --git a/source/blender/depsgraph/intern/depsgraph_tag.cc b/source/blender/depsgraph/intern/depsgraph_tag.cc
index 59f0c8c1933..392514990e3 100644
--- a/source/blender/depsgraph/intern/depsgraph_tag.cc
+++ b/source/blender/depsgraph/intern/depsgraph_tag.cc
@@ -325,25 +325,31 @@ void deg_graph_id_tag_legacy_compat(
        * tagging here. */
       case ID_ME: {
         Mesh *mesh = (Mesh *)id;
-        ID *key_id = &mesh->key->id;
-        if (key_id != NULL) {
-          graph_id_tag_update(bmain, depsgraph, key_id, 0, update_source);
+        if (mesh->key != NULL) {
+          ID *key_id = &mesh->key->id;
+          if (key_id != NULL) {
+            graph_id_tag_update(bmain, depsgraph, key_id, 0, update_source);
+          }
         }
         break;
       }
       case ID_LT: {
         Lattice *lattice = (Lattice *)id;
-        ID *key_id = &lattice->key->id;
-        if (key_id != NULL) {
-          graph_id_tag_update(bmain, depsgraph, key_id, 0, update_source);
+        if (lattice->key != NULL) {
+          ID *key_id = &lattice->key->id;
+          if (key_id != NULL) {
+            graph_id_tag_update(bmain, depsgraph, key_id, 0, update_source);
+          }
         }
         break;
       }
       case ID_CU: {
         Curve *curve = (Curve *)id;
-        ID *key_id = &curve->key->id;
-        if (key_id != NULL) {
-          graph_id_tag_update(bmain, depsgraph, key_id, 0, update_source);
+        if (curve->key != NULL) {
+          ID *key_id = &curve->key->id;
+          if (key_id != NULL) {
+            graph_id_tag_update(bmain, depsgraph, key_id, 0, update_source);
+          }
         }
         break;
       }