--- a/extensions/spellcheck/src/mozInlineSpellChecker.cpp
+++ b/extensions/spellcheck/src/mozInlineSpellChecker.cpp
@@ -940,17 +940,18 @@ mozInlineSpellChecker::ReplaceWord(nsIDO
     nsCOMPtr<nsISelection> selection;
     res = editor->GetSelection(getter_AddRefs(selection));
     NS_ENSURE_SUCCESS(res, res);
     selection->RemoveAllRanges();
     selection->AddRange(range);
     editor->DeleteSelection(nsIEditor::eNone, nsIEditor::eStrip);
 
     nsCOMPtr<nsIPlaintextEditor> textEditor(do_QueryReferent(mEditor));
-    textEditor->InsertText(newword);
+    if (textEditor)
+      textEditor->InsertText(newword);
 
     editor->EndTransaction();
   }
 
   return NS_OK;
 }
 
 // mozInlineSpellChecker::AddWordToDictionary