Index: /branches/mt4.11/lib/MT/Core.pm
===================================================================
--- /branches/mt4.11/lib/MT/Core.pm (revision 1375)
+++ /branches/mt4.11/lib/MT/Core.pm (revision 1377)
@@ -803,5 +803,5 @@
     $cfg->set_internal( 'ProcessMemoryCommand', @_ ) if @_;
     my $cmd = $cfg->get_internal('ProcessMemoryCommand');
-    unless ($cmd) {
+    unless (defined $cmd) {
         my $os = $^O;
         if ($os eq 'darwin') {