diff --git a/Workspace/server/src/main/java/com/pqt/server/servlets/QueryServlet.java b/Workspace/server/src/main/java/com/pqt/server/servlets/QueryServlet.java
index a880365f..81c8b087 100644
--- a/Workspace/server/src/main/java/com/pqt/server/servlets/QueryServlet.java
+++ b/Workspace/server/src/main/java/com/pqt/server/servlets/QueryServlet.java
@@ -66,7 +66,10 @@ public class QueryServlet extends HttpServlet {
 
                         Message msg = messageToolFactory.getObjectParser(Message.class).parse(messageToHandle);
 
-                        LOGGER.debug("Traitement du message (type : '{}', auteur : '{}')", msg.getType(), msg.getUser().getUsername());
+                        if(msg.getUser()!=null)
+                            LOGGER.debug("Traitement du message (type : '{}', auteur : '{}')", msg.getType(), msg.getUser().getUsername());
+                        else
+                            LOGGER.debug("Traitement du message (type : '{}', auteur : 'null')", msg.getType());
 
                         Message resp = msgHandler.handleMessage(msg);