--- lib/Sub/Uplevel.pm.orig	2006-03-18 19:33:47.000000000 -0500
+++ lib/Sub/Uplevel.pm	2006-03-18 19:35:03.000000000 -0500
@@ -120,7 +120,7 @@ before or after Sub::Uplevel::uplevel().
         # Yes, we need a C style for loop here since $height changes
         for( my $up = 1;  $up <= $height + 1;  $up++ ) {
             my @caller = CORE::caller($up);
-            if( $caller[0] eq __PACKAGE__ ) {
+		if( defined $caller[0] && $caller[0] eq __PACKAGE__ ) {
                 $height++;
                 $height += $Up_Frames unless $saw_uplevel;
                 $saw_uplevel = 1;