If you did something wrong more than once and gave the same apology that statement would make total sense. The first time though is unfair and kind of selfish minded.
Spilling something is usually a mistake, and often can be mitigated; the point is that mere repitition of error is insufficient to prove moral degeneracy.
I'd say no.
Your thesis needs work IMO.
Make sure you don't fail morally by ever presenting an incomplete/unsound thesis again!