Everybody nulls sometimes

chrome/browser/spellchecker/spellcheck_message_filter.cc

Index: chrome/browser/spellchecker/spellcheck_message_filter.cc
diff --git a/chrome/browser/spellchecker/spellcheck_message_filter.cc b/chrome/browser/spellchecker/spellcheck_message_filter.cc
index 66faf230f1d8b7c8aee1edad49b621fe5a7f85b0..4de8b1bde5d08c43ce71554909de0307ab906c5b 100644
--- a/chrome/browser/spellchecker/spellcheck_message_filter.cc
+++ b/chrome/browser/spellchecker/spellcheck_message_filter.cc
@@ -101,9 +101,12 @@ void SpellCheckMessageFilter::OnRespondDocumentMarkers(
     const std::vector<uint32>& markers) {
   SpellcheckService* spellcheck =
       SpellcheckServiceFactory::GetForRenderProcessId(render_process_id_);
-  DCHECK(spellcheck);
-  spellcheck->GetFeedbackSender()->OnReceiveDocumentMarkers(render_process_id_,
-                                                            markers);
+  // Spellcheck service may not be available for a renderer process that is
+  // shutting down.
+  if (!spellcheck)
+    return;
+  spellcheck->GetFeedbackSender()->OnReceiveDocumentMarkers(
+      render_process_id_, markers);
 }
 
 #if !defined(OS_MACOSX)