diff --git a/include/clang/Basic/SourceManager.h b/include/clang/Basic/SourceManager.h
index 985ddd6..52b5c45 100644
--- a/include/clang/Basic/SourceManager.h
+++ b/include/clang/Basic/SourceManager.h
@@ -1213,6 +1213,10 @@
   }
 
   const SrcMgr::SLocEntry &getSLocEntry(FileID FID, bool *Invalid = 0) const {
+    if (FID.ID == 0 || FID.ID == -1) {
+      if (Invalid) *Invalid = true;
+      return LocalSLocEntryTable[0];
+    }
     return getSLocEntryByID(FID.ID);
   }
 
diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index e085a27..3130a02 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -2814,7 +2814,7 @@
   FileID fileID = SM.getFileID(ExpansionLoc);
   bool Invalid = false;
   const SrcMgr::SLocEntry &sloc = SM.getSLocEntry(fileID, &Invalid);
-  if (!sloc.isFile() || Invalid) {
+  if (Invalid || !sloc.isFile()) {
     createNullLocation(file, line, column, offset);
     return;
   }