room invite fix

app/services/chat.js

@@ -159,7 +159,12 @@ export default class ChatService extends SiteService {
         { email: inviteDefinition.usernameOrEmail },
       ],
     }).lean();
-    if (invitee) {
+
+    const existingInvite = await ChatRoomInvite
+      .find({ room: room._id, member: invitee._id })
+      .select('_id')
+      .lean();
+    if (existingInvite) {
       throw new SiteError(400, 'User already invited to room');
     }