diff --git a/clang/lib/Tooling/NodeIntrospection.cpp b/clang/lib/Tooling/NodeIntrospection.cpp
--- a/clang/lib/Tooling/NodeIntrospection.cpp
+++ b/clang/lib/Tooling/NodeIntrospection.cpp
@@ -44,9 +44,6 @@
 bool RangeLessThan::operator()(
     std::pair<SourceRange, SharedLocationCall> const &LHS,
     std::pair<SourceRange, SharedLocationCall> const &RHS) const {
-  if (!LHS.first.isValid() || !RHS.first.isValid())
-    return false;
-
   if (LHS.first.getBegin() < RHS.first.getBegin())
     return true;
   else if (LHS.first.getBegin() != RHS.first.getBegin())
diff --git a/clang/unittests/Introspection/IntrospectionTest.cpp b/clang/unittests/Introspection/IntrospectionTest.cpp
--- a/clang/unittests/Introspection/IntrospectionTest.cpp
+++ b/clang/unittests/Introspection/IntrospectionTest.cpp
@@ -91,6 +91,20 @@
   EXPECT_EQ(slm.size(), 2u);
 }
 
+TEST(Introspection, SourceLocations_CallContainer2) {
+  SourceRangeMap slm;
+  SharedLocationCall Prefix;
+  slm.insert(
+      std::make_pair(SourceRange(), llvm::makeIntrusiveRefCnt<LocationCall>(
+                                        Prefix, "getCXXOperatorNameRange")));
+  EXPECT_EQ(slm.size(), 1u);
+
+  slm.insert(std::make_pair(
+      SourceRange(),
+      llvm::makeIntrusiveRefCnt<LocationCall>(Prefix, "getSourceRange")));
+  EXPECT_EQ(slm.size(), 2u);
+}
+
 TEST(Introspection, SourceLocations_CallChainFormatting) {
   SharedLocationCall Prefix;
   auto chainedCall = llvm::makeIntrusiveRefCnt<LocationCall>(