diff --git a/paddle/fluid/framework/details/fetch_op_handle.cc b/paddle/fluid/framework/details/fetch_op_handle.cc
index b1c9dd0d15223f7d1bf6ea44144589f1de927e3e..4a8f201108f78dbaae64862a1828484fd9fb8874 100644
--- a/paddle/fluid/framework/details/fetch_op_handle.cc
+++ b/paddle/fluid/framework/details/fetch_op_handle.cc
@@ -53,6 +53,7 @@ void FetchOpHandle::RunImpl() {
   platform::CPUPlace cpu;
   auto &scopes = *local_scopes_;
 
+  PADDLE_ENFORCE_EQ(inputs_.size(), scopes.size());
   for (size_t i = 0; i < scopes.size(); ++i) {
     auto &scope = scopes[i];
     auto *var =