diff --git a/sat/plugins/plugin_exp_lang_detect.py b/sat/plugins/plugin_exp_lang_detect.py
index faa9d4af..5321927d 100644
--- a/sat/plugins/plugin_exp_lang_detect.py
+++ b/sat/plugins/plugin_exp_lang_detect.py
@@ -69,12 +69,13 @@ class LangDetect(object):
         host.trigger.add("messageReceived", self.messageReceivedTrigger)
         host.trigger.add("sendMessage", self.MessageSendTrigger)
 
-    def addLanguage(self, mess_data):
+    def add_language(self, mess_data):
         message = mess_data["message"]
         if len(message) == 1 and list(message.keys())[0] == "":
-            msg = list(message.values())[0]
-            lang = identifier.classify(msg)[0]
-            mess_data["message"] = {lang: msg}
+            msg = list(message.values())[0].strip()
+            if msg:
+                lang = identifier.classify(msg)[0]
+                mess_data["message"] = {lang: msg}
         return mess_data
 
     def messageReceivedTrigger(self, client, message_elt, post_treat):
@@ -84,7 +85,7 @@ class LangDetect(object):
             NAME, CATEGORY, profile_key=client.profile
         )
         if lang_detect:
-            post_treat.addCallback(self.addLanguage)
+            post_treat.addCallback(self.add_language)
         return True
 
     def MessageSendTrigger(self, client, data, pre_xml_treatments, post_xml_treatments):
@@ -92,5 +93,5 @@ class LangDetect(object):
             NAME, CATEGORY, profile_key=client.profile
         )
         if lang_detect:
-            self.addLanguage(data)
+            self.add_language(data)
         return True