From 9c92d0304fd34236d0b123fb5def0725596865c3 Mon Sep 17 00:00:00 2001
From: dzhwinter <dzhwinter@gmail.com>
Date: Tue, 19 Feb 2019 16:32:56 +0800
Subject: [PATCH] fix default value. test=develop

---
 paddle/fluid/framework/details/memory_optimize_pass.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/paddle/fluid/framework/details/memory_optimize_pass.cc b/paddle/fluid/framework/details/memory_optimize_pass.cc
index b35b967c7..93d08649d 100644
--- a/paddle/fluid/framework/details/memory_optimize_pass.cc
+++ b/paddle/fluid/framework/details/memory_optimize_pass.cc
@@ -235,7 +235,9 @@ void MemoryOptimizePass::RenameVarInGraphDesc(const std::string& var,
     auto* op_desc = op->Op();
     op_desc->RenameInput(var, cache_var);
     op_desc->RenameOutput(var, cache_var);
-    if (op_desc->Block()->HasVar(var)) op_desc->Block()->RemoveVar(var);
+    if (op_desc->Block() != nullptr && op_desc->Block()->HasVar(var)) {
+      op_desc->Block()->RemoveVar(var);
+    }
     op_desc->Flush();
   }
 }
-- 
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