Race condition on action: Invite members to a team

I've found a race condition vulnerability which allows the invitation of the same member multiple times to a single team via the dashboard.

POST /team/memberships HTTP/2
Host: dashboard.omise.co
Cookie: ██████████
Content-Length: 271
Cache-Control: max-age=0
Sec-Ch-Ua: "Chromium";v="91", " Not;A Brand";v="99"
Sec-Ch-Ua-Mobile: ?0
Upgrade-Insecure-Requests: 1
Origin: ███
Content-Type: application/x-www-form-urlencoded
User-Agent: …