Anomaly: if friend request accepted = friend accepted + new subscriber

Hello,

A user requests as a friend from another use r:
When he accepts the request as a friend then he becomes a good friend with this user but he also becomes a subscriber of this user.

the user also receives 2 email notifications or place of one:
- your friend request has been accepted (this is normal)
- and you subscribe to .... (he should not receive this notification because there was no subscription request)

Can you watch to correct this bad chaining.

cordialy.