From 8bf92dba21fa8cbfd1f7eb8c5b5a02c252a4d5ef Mon Sep 17 00:00:00 2001
From: Bairong <zhuangbairong@huawei.com>
Date: Sat, 19 Dec 2020 15:06:41 +0800
Subject: [PATCH] fix nullptr problem

---
 mindspore/ccsrc/debug/draw.cc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mindspore/ccsrc/debug/draw.cc b/mindspore/ccsrc/debug/draw.cc
index ecae932e53..23deb1d5c7 100644
--- a/mindspore/ccsrc/debug/draw.cc
+++ b/mindspore/ccsrc/debug/draw.cc
@@ -421,7 +421,11 @@ static void DrawValueNode(Graphviz *const graph_obj, const ValueNodePtr &node) {
             graph_obj->buffer() << "<br/>";
           }
           graph_obj->buffer() << attr.first << " ";
-          graph_obj->buffer() << attr.second->ToString();
+          if (attr.second == nullptr) {
+            graph_obj->buffer() << " ";
+          } else {
+            graph_obj->buffer() << attr.second->ToString();
+          }
           i++;
         }
       }