diff --git a/modules/cellframe-sdk/chain/src/wrapping_dap_chain_cs.c b/modules/cellframe-sdk/chain/src/wrapping_dap_chain_cs.c
index ba8f49cf88ecc229ce16406a74fd8c9c9a1808e7..652655ac4fbbd8c89f3f0a63e632bb0df384c1b5 100644
--- a/modules/cellframe-sdk/chain/src/wrapping_dap_chain_cs.c
+++ b/modules/cellframe-sdk/chain/src/wrapping_dap_chain_cs.c
@@ -91,7 +91,7 @@ PyObject *dap_chain_class_add_py (PyObject *self, PyObject *args){
     Py_XINCREF(obj_callback_init);
     Py_XDECREF(binded_object_callback_new_cfg);
     binded_object_callback_new_cfg = obj_callback_init;
-    dap_chain_cs_type_add(cs_str, ((PyDapChainCsObject*)self)->callback_new_cfg);
+    dap_chain_cs_type_add(cs_str, ((PyDapChainCsObject*)self)->callback_new_cfg, NULL);
     return PyLong_FromLong(0);
 }
 PyObject *dap_chain_class_create_py(PyObject *self, PyObject *args){