From e7eeb7004bbda01f62ea5e66f156645c3dadf1e2 Mon Sep 17 00:00:00 2001
From: Warren Falk <warren@warrenfalk.com>
Date: Mon, 14 May 2018 16:39:26 -0400
Subject: fix index out of range error in C# generation using msvc (#1329)

---
 src/google/protobuf/compiler/csharp/csharp_helpers.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/google/protobuf/compiler/csharp/csharp_helpers.cc b/src/google/protobuf/compiler/csharp/csharp_helpers.cc
index 5bca1ffa..04b61074 100644
--- a/src/google/protobuf/compiler/csharp/csharp_helpers.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_helpers.cc
@@ -169,7 +169,7 @@ std::string UnderscoresToCamelCase(const std::string& input,
     }
   }
   // Add a trailing "_" if the name should be altered.
-  if (input[input.size() - 1] == '#') {
+  if (input.size() > 0 && input[input.size() - 1] == '#') {
     result += '_';
   }
   return result;
-- 
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