when updating peers from erasePeer() lock the map before mutating;

src/fne/network/TrafficNetwork.cpp

@@ -2258,11 +2258,13 @@ void TrafficNetwork::erasePeer(uint32_t peerId)
 {
     bool neighborFNE = false;
     {
+        m_peers.lock();
         auto it = std::find_if(m_peers.begin(), m_peers.end(), [&](PeerMapPair x) { return x.first == peerId; });
         if (it != m_peers.end()) {
             neighborFNE = it->second->peerClass() == PEER_CONN_CLASS_NEIGHBOR;
             m_peers.erase(peerId);
         }
+        m_peers.unlock();
     }
 
     // erase any CC maps for this peer