Help understanding error in LocalClient.ProcessInternalMessages

I got this error a couple times last night, and I'm not too sure what to say about it -

Looking over the loops in ProcessInternalMessages, it seems like this error should never happen. So why would it?

Including the LocalClient.ProcessInternalMessages code -

Code (CSharp):

1. private void ProcessInternalMessages()
2. {
3.     if (m_InternalMsgs.Count == 0)
4.     {
5.         return;
6.     }
7.  
8.     // new msgs will get put in m_InternalMsgs2
9.     List<InternalMsg> tmp = m_InternalMsgs;
10.     m_InternalMsgs = m_InternalMsgs2;
11.  
12.     // iterate through existing set
13.     foreach (var msg in tmp)
14.     {
15.         if (s_InternalMessage.reader == null)
16.         {
17.             s_InternalMessage.reader = new NetworkReader(msg.buffer);
18.         }
19.         else
20.         {
21.             s_InternalMessage.reader.Replace(msg.buffer);
22.         }
23.         s_InternalMessage.reader.ReadInt16(); //size
24.         s_InternalMessage.channelId = msg.channelId;
25.         s_InternalMessage.conn = connection;
26.         s_InternalMessage.msgType = s_InternalMessage.reader.ReadInt16();
27.  
28.         m_Connection.InvokeHandler(s_InternalMessage);
29.         m_FreeMessages.Push(msg);
30.         connection.lastMessageTime = Time.time;
31.     }
32.  
33.     // put m_InternalMsgs back and clear it
34.     m_InternalMsgs = tmp;
35.     m_InternalMsgs.Clear();
36.  
37.     // add any newly generated msgs in m_InternalMsgs2 and clear it
38.     foreach (var msg in m_InternalMsgs2)
39.     {
40.         m_InternalMsgs.Add(msg);
41.     }
42.     m_InternalMsgs2.Clear();
43. }

I'd guess one of those foreach loops is messing up..probably the first one. Looking at this a bit deeper, it seems like this function is only really called by UNetStaticUpdate so I'm not totally sure how this could be breaking.

 

bump. saw this happen again tonight. any ideas?