diff --git a/delojza.py b/delojza.py
index 2c58a8e..61237b6 100755
--- a/delojza.py
+++ b/delojza.py
@@ -463,7 +463,7 @@ class DelojzaBot:
             else:
                 self.last_hashtags[update.message.chat.id] = update.message.from_user, datetime.now(), hashtags
         else:
-            if self.markov:
+            if self.markov and update.message.text:
                 self.markov.add_to_corpus(update.message.text)
 
     def _get_tag_dirs(self):