I accidentally used settings that are not so common (for example, putting a real model of a system in space), and did the whole analysis on that setting. The analysis itself is correct on that model, it's just that you would have to apply certain conditions. I realized this issue after submitting my thesis, and my supervisor is currently on a vacation, so I cannot consult him. Will this make me fail my master thesis?
I have to mention that my supervisor checked my thesis several times, and this mistake was always present and he saw it, but probably overlooked it.