Index: clang/lib/AST/RawCommentList.cpp
===================================================================
--- clang/lib/AST/RawCommentList.cpp
+++ clang/lib/AST/RawCommentList.cpp
@@ -431,7 +431,7 @@
   };
 
   auto DropTrailingNewLines = [](std::string &Str) {
-    while (Str.back() == '\n')
+    while (not Str.empty() and Str.back() == '\n')
       Str.pop_back();
   };