Index: clang/lib/Format/TokenAnnotator.cpp
===================================================================
--- clang/lib/Format/TokenAnnotator.cpp
+++ clang/lib/Format/TokenAnnotator.cpp
@@ -2006,7 +2006,7 @@
       Current.setType(TT_LambdaArrow);
     } else if (Current.is(tok::arrow) && AutoFound &&
                (Line.MightBeFunctionDecl || Line.InPPDirective) &&
-               Current.NestingLevel == 0 &&
+               Current.NestingLevel == 0 && Current.Previous &&
                !Current.Previous->isOneOf(tok::kw_operator, tok::identifier)) {
       // not auto operator->() -> xxx;
       Current.setType(TT_TrailingReturnArrow);
Index: clang/lib/Lex/PPDirectives.cpp
===================================================================
--- clang/lib/Lex/PPDirectives.cpp
+++ clang/lib/Lex/PPDirectives.cpp
@@ -547,7 +547,7 @@
   } SkippingRangeState(*this);
 
   while (true) {
-    if (CurLexer->isDependencyDirectivesLexer()) {
+    if (CurLexer && CurLexer->isDependencyDirectivesLexer()) {
       CurLexer->LexDependencyDirectiveTokenWhileSkipping(Tok);
     } else {
       SkippingRangeState.beginLexPass();