diff --git a/src/sql/engine/expr/ob_expr_frame_info.cpp b/src/sql/engine/expr/ob_expr_frame_info.cpp
index 1e0fae94ca..ab35252944 100644
--- a/src/sql/engine/expr/ob_expr_frame_info.cpp
+++ b/src/sql/engine/expr/ob_expr_frame_info.cpp
@@ -712,7 +712,10 @@ int ObTempExpr::deep_copy(ObIAllocator &allocator, ObTempExpr *&dst) const
 {
   int ret = OB_SUCCESS;
   char *buf = static_cast<char *>(allocator.alloc(sizeof(ObTempExpr)));
-  CK(OB_NOT_NULL(buf));
+  if (OB_ISNULL(buf)) {
+    ret = OB_ALLOCATE_MEMORY_FAILED;
+    LOG_WARN("fail to alloc mem in temp expr deep copy", K(ret));
+  }
   OX(dst = new(buf)ObTempExpr(allocator));
   OZ(dst->assign(*this, allocator));
   OX(dst->expr_idx_ = expr_idx_);
diff --git a/src/sql/engine/ob_exec_context.cpp b/src/sql/engine/ob_exec_context.cpp
index 329c5ca3f9..6f1132d2b4 100644
--- a/src/sql/engine/ob_exec_context.cpp
+++ b/src/sql/engine/ob_exec_context.cpp
@@ -343,7 +343,10 @@ int ObExecContext::build_temp_expr_ctx(const ObTempExpr &temp_expr, ObTempExprCt
   char **frames = NULL;
   char *mem = static_cast<char*>(get_allocator().alloc(sizeof(ObTempExprCtx)));
   ObArray<char *> tmp_param_frame_ptrs;
-  CK(OB_NOT_NULL(mem));
+  if (OB_ISNULL(mem)) {
+    ret = OB_ALLOCATE_MEMORY_FAILED;
+    LOG_WARN("no more memory to create temp expr ctx", K(ret));
+  }
   OX(temp_expr_ctx = new(mem)ObTempExprCtx(*this));
   OZ(temp_expr.alloc_frame(get_allocator(), tmp_param_frame_ptrs, frame_cnt, frames));
   OX(temp_expr_ctx->frames_ = frames);