Unless this grands you additional rights, the answer will probably be: "yep, nice find, does not matter" or something like that. On the other hand I dont know where the data are storred, so this might result in some sort of overflow.
Probably hehe, though it is annoying, but I think the bounties are for stuff that can cause damage to the site or something.
And there's this: You must disclose the vulnerability only to me. Do not test your vulnerability in such a way that it would give others any information about the vulnerability.