diff --git a/slack/threads.py b/slack/threads.py
index 77aa1c4..723daf0 100644
--- a/slack/threads.py
+++ b/slack/threads.py
@@ -49,7 +49,7 @@ class Thread:
         # Read original message list
         o_list = []
         for message in self.do_fetch_messages(self.__last_ts):
-            if message["text"] != None:
+            if message["text"] != None and len(message["text"]) > 0:
                 o_list += [ chat.Message(message) ]
         o_list.sort()