Index: trunk/Nebulous/t/70_neb-ls.t
===================================================================
--- trunk/Nebulous/t/70_neb-ls.t	(revision 24290)
+++ trunk/Nebulous/t/70_neb-ls.t	(revision 24300)
@@ -38,5 +38,5 @@
 
 # NEB_SERVER env var not set
-undef $ENV{'NEB_SERVER'};
+undef $ENV{'NEB_SERVER'} if defined $ENV{'NEB_SERVER'};
 Test::Nebulous->setup;