1 files changed, 4 insertions, 1 deletions
diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index c21fa0d74e5..1b39442610f 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -38,7 +38,10 @@ public:
   }
   ~ScopedDeclarationState() {
     Stack.pop_back();
-    Line.MustBeDeclaration = Stack.back();
+    if (!Stack.empty())
+      Line.MustBeDeclaration = Stack.back();
+    else
+      Line.MustBeDeclaration = true;
   }
 private:
   UnwrappedLine &Line;