From b5514ec437a0bdbe333211afda7877b4b00406fc Mon Sep 17 00:00:00 2001
From: Richard Ramos <info@richardramos.me>
Date: Fri, 16 Mar 2018 15:28:35 -0400
Subject: [PATCH] Additional require to avoid spamming

---
 contracts/communication/MessageTribute.sol | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/contracts/communication/MessageTribute.sol b/contracts/communication/MessageTribute.sol
index babe26d..b9e4677 100644
--- a/contracts/communication/MessageTribute.sol
+++ b/contracts/communication/MessageTribute.sol
@@ -84,6 +84,8 @@ contract MessageTribute is Controlled {
     {
         Fee memory f = getFee(_from);
         require(f.amount <= balances[msg.sender]);
+        require(audienceRequested[_from][msg.sender].blockNum == 0);
+        
         AudienceRequested(_from, msg.sender);
         audienceRequested[_from][msg.sender] = Audience(block.number, f);
         balances[msg.sender] -= f.amount;