diff --git a/source/blender/blenkernel/intern/object.c b/source/blender/blenkernel/intern/object.c
index 43dbc34f3d3f238d9fc60e99a9399a07c135c3aa..dbc8e4df4c43ed7048ef723d51360a7043e17add 100644
--- a/source/blender/blenkernel/intern/object.c
+++ b/source/blender/blenkernel/intern/object.c
@@ -1282,6 +1282,7 @@ static ParticleSystem *copy_particlesystem(ParticleSystem *psys)
 	psysn->pdd = NULL;
 	psysn->effectors = NULL;
 	psysn->tree = NULL;
+	psysn->bvhtree = NULL;
 	
 	BLI_listbase_clear(&psysn->pathcachebufs);
 	BLI_listbase_clear(&psysn->childcachebufs);