WPushBitton clicked() can be called issued twice

[Nuxar1]

When doing the following

	auto button = actions->addNew<Wt::WPushButton>("Delete");
	button->clicked().connect([=] () mutable {
		button->disable();
	});

it is still possible to click the button twice by pressing enter and left mouse button at the same time. Is there a "clean" way to only have one single call possible per button (e.g. to delete someting from the site)