diff --git a/src/pl/ob_pl.cpp b/src/pl/ob_pl.cpp
index b509483515..245d98272e 100644
--- a/src/pl/ob_pl.cpp
+++ b/src/pl/ob_pl.cpp
@@ -3336,11 +3336,12 @@ int ObPLExecState::init(const ParamStore *params, bool is_anonymous)
     OZ(func_.get_frame_info().pre_alloc_exec_memory(*ctx_.exec_ctx_, ctx_.allocator_));
   }
 
+  // init params may use exec stack, need append to pl context first
+  CK (OB_NOT_NULL(top_context_ = ctx_.exec_ctx_->get_my_session()->get_pl_context()));
+  OZ (top_context_->get_exec_stack().push_back(this));
 
   OZ (init_params(params, is_anonymous));
 
-  CK (OB_NOT_NULL(top_context_ = ctx_.exec_ctx_->get_my_session()->get_pl_context()));
-  OZ (top_context_->get_exec_stack().push_back(this));
   OX (top_context_->set_has_output_arguments(!func_.get_out_args().is_empty()));
 
   if (OB_SUCC(ret)) {
diff --git a/src/sql/engine/expr/ob_expr_object_construct.cpp b/src/sql/engine/expr/ob_expr_object_construct.cpp
index a03b9d3ced..7a311e5253 100644
--- a/src/sql/engine/expr/ob_expr_object_construct.cpp
+++ b/src/sql/engine/expr/ob_expr_object_construct.cpp
@@ -138,6 +138,7 @@ int ObExprObjectConstruct::newx(ObEvalCtx &ctx, ObObj &result, uint64_t udt_id)
     int64_t init_size = OB_INVALID_SIZE;
     ObArenaAllocator tmp_alloc;
     const pl::ObUserDefinedType *user_type = NULL;
+    CK (OB_NOT_NULL(ns));
     OZ (ns->get_user_type(udt_id, user_type, &tmp_alloc));
     CK (OB_NOT_NULL(user_type));
     OZ (user_type->newx(alloc, ns, ptr));