fix bugs

packages/component-invite/src/routes/collectionsInvitations/post.js

@@ -62,6 +62,10 @@ module.exports = models => async (req, res) => {
 
     let resend = false
     if (invitation !== undefined) {
+      if (invitation.hasAnswer)
+        return res
+          .status(400)
+          .json({ error: `${invitation.id} has already been answered` })
       invitation.timestamp = Date.now()
       await collection.save()
       resend = true