--- a/lib/DebugInfo/PDB/Native/PDBStringTable.cpp	Sun Dec 23 19:23:36 2018 +0900
+++ b/lib/DebugInfo/PDB/Native/PDBStringTable.cpp	Wed Aug 14 19:46:37 2019 +0900
@@ -1,9 +1,8 @@
 //===- PDBStringTable.cpp - PDB String Table ---------------------*- C++-*-===//
 //
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
@@ -122,7 +121,10 @@
     // we iterate the entire array.
     uint32_t Index = (Start + I) % Count;
 
+    // If we find 0, it means the item isn't in the hash table.
     uint32_t ID = IDs[Index];
+    if (ID == 0)
+      return make_error<RawError>(raw_error_code::no_entry);
     auto ExpectedStr = getStringForID(ID);
     if (!ExpectedStr)
       return ExpectedStr.takeError();