diff --git a/lib/Slic3r/GUI/Projector.pm b/lib/Slic3r/GUI/Projector.pm
index 3f7d43a905..d2cef6edaf 100644
--- a/lib/Slic3r/GUI/Projector.pm
+++ b/lib/Slic3r/GUI/Projector.pm
@@ -289,7 +289,7 @@ sub new {
                 );
                 if (!$res || !$sender->wait_connected) {
                     Slic3r::GUI::show_error(undef, "Connection failed. Check serial port and speed.");
-                    #return;
+                    return;
                 }
                 my $dlg = Slic3r::GUI::Controller::ManualControlDialog->new
                     ($self, $self->config, $sender);