diff --git a/peer/cwtch_peer.go b/peer/cwtch_peer.go
index 9f67d1b..c4002a3 100644
--- a/peer/cwtch_peer.go
+++ b/peer/cwtch_peer.go
@@ -433,6 +433,7 @@ func (cp *cwtchPeer) InviteOnionToGroup(onion string, groupid string) error {
 	cp.mutex.Lock()
 	group := cp.Profile.GetGroup(groupid)
 	if group == nil {
+		cp.mutex.Unlock()
 		return errors.New("invalid group id")
 	}
 	invite, err := group.Invite()