--- a/flys-client/src/main/java/de/intevation/flys/client/server/auth/UserClient.java	Fri Sep 07 15:58:10 2012 +0000
+++ b/flys-client/src/main/java/de/intevation/flys/client/server/auth/UserClient.java	Sat Sep 08 11:26:30 2012 +0000
@@ -50,6 +50,11 @@
     }
 
     public boolean createUser(User user) throws ConnectionException {
+        if(user == null) {
+            logger.warn("createUser: given user is null");
+            return false;
+        }
+        
         logger.debug("Creating new user " + user.getName());
         HttpClient client = new HttpClientImpl(this.url);
 
@@ -107,6 +112,10 @@
     }
 
     public Element findUser(User user) throws ConnectionException {
+        if(user == null) {
+            throw new IllegalArgumentException("user is null");
+        }
+        
         HttpClient client = new HttpClientImpl(this.url);
 
         Document document = XMLUtils.newDocument();