--- ntop-3.3.10.org/http.c	2009-09-13 14:23:48.895204786 +0530
+++ ntop-3.3.10/http.c	2009-09-13 14:45:35.603204376 +0530
@@ -3439,6 +3439,9 @@
     strncpy(thePw, &outBuffer[i+1], thePwLen-1)[thePwLen-1] = '\0';
   }
 
+  if(user == NULL)
+    user = "";
+
   if(strlen(user) >= sizeof(theHttpUser)) user[sizeof(theHttpUser)-1] = '\0';
   strcpy(theHttpUser, user);