Fix crash when opening a Blender file containing Alembic data.

Was also affecting object linking.

3 files changed, 6 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/constraint.c b/source/blender/blenkernel/intern/constraint.c
index 9d4de30aa2c..cb74dbcd8d1 100644
--- a/source/blender/blenkernel/intern/constraint.c
+++ b/source/blender/blenkernel/intern/constraint.c
@@ -4404,6 +4404,7 @@ static void transformcache_free(bConstraint *con)
 #ifdef WITH_ALEMBIC
 		CacheReader_free(data->reader);
 #endif
+		data->reader = NULL;
 	}
 }
 
diff --git a/source/blender/blenloader/intern/readfile.c b/source/blender/blenloader/intern/readfile.c
index af73410728b..03c5d083456 100644
--- a/source/blender/blenloader/intern/readfile.c
+++ b/source/blender/blenloader/intern/readfile.c
@@ -5302,6 +5302,10 @@ static void direct_link_modifiers(FileData *fd, ListBase *lb)
 			csmd->delta_cache = NULL;
 			csmd->delta_cache_num = 0;
 		}
+		else if (md->type == eModifierType_MeshSequenceCache) {
+			MeshSeqCacheModifierData *msmcd = (MeshSeqCacheModifierData *)md;
+			msmcd->reader = NULL;
+		}
 	}
 }
 
diff --git a/source/blender/modifiers/intern/MOD_meshsequencecache.c b/source/blender/modifiers/intern/MOD_meshsequencecache.c
index 72644d56323..2f00a7c71b0 100644
--- a/source/blender/modifiers/intern/MOD_meshsequencecache.c
+++ b/source/blender/modifiers/intern/MOD_meshsequencecache.c
@@ -81,6 +81,7 @@ static void freeData(ModifierData *md)
 #ifdef WITH_ALEMBIC
 		CacheReader_free(mcmd->reader);
 #endif
+		mcmd->reader = NULL;
 	}
 }