Is it possible to have less than 0 LP

A friend of mine crashed in champselect after winning a promo and his client showed that he got -3 LP. Somehow we got into a discussion about whether or not it was a glitch in his client. I told him the system is simplye made so that you cant have less than 0 LP, but he means otherwise. Now, i want your answers, apparently he just wont believe me.
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