Fix Race Condition

app/app.go

@@ -160,6 +160,8 @@ func (app *application) ListProfiles() []string {
 
 // GetPeer returns a cwtchPeer for a given onion address
 func (app *application) GetPeer(onion string) peer.CwtchPeer {
+	app.appmutex.Lock()
+	defer app.appmutex.Unlock()
 	if profile, ok := app.peers[onion]; ok {
 		return profile
 	}