diff -ru vpopmail-5.4.9_orig/vcdb.c vpopmail-5.4.9/vcdb.c
--- vpopmail-5.4.9_orig/vcdb.c	2004-01-07 16:06:16.000000000 +0000
+++ vpopmail-5.4.9/vcdb.c	2005-02-11 11:06:34.000000000 +0000
@@ -236,7 +236,10 @@
     lowerit(user);
     lowerit(domain);
 
-    vget_assign(domain,NULL,0,&tuid,&tgid);
+    if (vget_assign(domain,NULL,0,&tuid,&tgid) == NULL) {
+        return(NULL);
+    }
+
     myuid = geteuid();
     if ( myuid != 0 && myuid != tuid ) {
 	return(NULL);