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In single-player, or while running as a server, sexp_deal_with_ship_flag() makes sure that object_flag, ship_flag, and p_object_flag aren't NUM_VALUES (i.e. not set) before trying to call flags.set() with them. However, the client code in multi_sexp_deal_with_ship_flag() had no such security checks, and as such would try to set NUM_VALUES, which is outside the range of valid flags; this led to a crash in Release builds and an Assertion otherwise.