diff --git a/udpserver.cpp b/udpserver.cpp
index 8f387f1..b6eb299 100644
--- a/udpserver.cpp
+++ b/udpserver.cpp
@@ -318,7 +318,8 @@ void udpServer::controlReceived()
                 passcode(user.username, usercomp);
                 QByteArray passcomp;
                 passcode(user.password, passcomp);
-                if (!strcmp(in->username, usercomp.constData()) && (!strcmp(in->password, user.password.toUtf8()) || !strcmp(in->password, passcomp.constData())))
+                if (!user.username.trimmed().isEmpty() && !user.password.trimmed().isEmpty() && !strcmp(in->username, usercomp.constData()) && 
+                    (!strcmp(in->password, user.password.toUtf8()) || !strcmp(in->password, passcomp.constData())))
                 {
                     current->isAuthenticated = true;
                     current->user = user;