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-rw-r--r--lib/Support/YAMLTraits.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Support/YAMLTraits.cpp b/lib/Support/YAMLTraits.cpp
index a31c31915a..8fcef40d24 100644
--- a/lib/Support/YAMLTraits.cpp
+++ b/lib/Support/YAMLTraits.cpp
@@ -516,7 +516,7 @@ void Output::output(StringRef s) {
void Output::outputUpToEndOfLine(StringRef s) {
this->output(s);
- if (StateStack.back() != inFlowSeq)
+ if (StateStack.empty() || StateStack.back() != inFlowSeq)
NeedsNewLine = true;
}