fix exist check

handlers/events.go

@@ -13,7 +13,7 @@ func (dh *DatabaseHandler) StartNewEvent(event *models.Event) error {
 		return errors.New("database not opened")
 	}
 
-	if nil == dh.database.Exists(&models.Event{}, "name", event.Name, false) {
+	if dh.database.Exists(&models.Event{}, "name", event.Name, false) {
 		return errors.New("event with name: " + event.Name + " exists already")
 	}