Index: Padre/lib/Padre/Wx/Main.pm
===================================================================
--- Padre/lib/Padre/Wx/Main.pm	(revision 14124)
+++ Padre/lib/Padre/Wx/Main.pm	(working copy)
@@ -927,6 +927,10 @@
 			$config->main_singleinstance_port,
 		);
 	} else {
+		return (
+			'127.0.0.1',
+			$config->main_singleinstance_port,
+		);
 		my $file = File::Spec->catfile(
 			Padre::Constant::CONFIG_DIR,
 			'single_instance.socket',