It was the Constitutional Court, not Supreme Court. Also, no, not really - that didn't start the crisis in any reasonable meaning of that word. In a correctly functioning democracy that would simply be blocked by Constitutional Court, and that's in fact exactly what happened. The problem started when currently ruling party replaced not only the extraneous judges, but also those judges who were lawfully supposed to be appointed by previous government. Of course the Constitutional Court deemed that unconstitutional, but that didn't stop the ruling party at all, and the rest is history.