party bug, can't leave it or invite someone in a new one

I'm in a party with someone I traded with, I left it but when entering my hideout the party is back. When clicking the leave button it says that the party does not exist. I asked him to invite me and I could leave it but it still comes back when entering my hideout.
I tried restarting my client and the party is still there.
The only way for me to temporary leave the party is to get invited by someone else and then leave or get kicked, but I'm only free until the next time I enter my hideout.
(sorry for my bad english)