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-rw-r--r--lib/Serialization/ASTWriter.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Serialization/ASTWriter.cpp b/lib/Serialization/ASTWriter.cpp
index 61ba5ab71b..3f537d21ab 100644
--- a/lib/Serialization/ASTWriter.cpp
+++ b/lib/Serialization/ASTWriter.cpp
@@ -1334,7 +1334,7 @@ void ASTWriter::WritePreprocessor(const Preprocessor &PP) {
// If the preprocessor has a preprocessing record, emit it.
unsigned NumPreprocessingRecords = 0;
if (PPRec) {
- unsigned IndexBase = PPRec->getNumPreallocatedEntities();
+ unsigned IndexBase = Chain ? PPRec->getNumPreallocatedEntities() : 0;
for (PreprocessingRecord::iterator E = PPRec->begin(Chain),
EEnd = PPRec->end(Chain);
E != EEnd; ++E) {