Crash in ZSocket.SendMessage()

[chrbauer]

There is a problem in the SendMessage(ZMessage) implementation. SendMessage(ZMessage) will call SendFrames(msg as IEnumerable) (ZSocket.cs at line 667). Here is the problem.

                public virtual bool SendFrames(IEnumerable<ZFrame> frames, ref int sent, ZSocketFlags flags, out ZError error)
		{
			// ... 
			bool framesIsList = frames is IList<ZFrame>;  // true for ZMessage
			ZFrame[] _frames = frames.ToArray();

			for (int i = 0, l = _frames.Length; i < l; ++i)
			{
				ZFrame frame = _frames[i];

				if (i == l - 1 && !more)
				{
					flags = flags & ~ZSocketFlags.More;
				}

				if (!SendFrame(frame, flags, out error)) // now you are not allowed to call frame.Dispose() anymore
				{
					return false;
				}

				if (framesIsList)
				{
					((IList<ZFrame>)frames).Remove(frame); // calls ZMessage.Remove(frame, true), which disposes the frame. See ZMessage.cs:321 and 334
				}

				++sent;
			}

			return true;
		}

I get a NullReferenceException with this call stack. I thinks it's related

15:00:44    bei ZeroMQ.ZMessage.Remove(ZFrame item)
15:00:44    bei ZeroMQ.ZSocket.SendFrames(IEnumerable`1 frames, Int32& sent, ZSocketFlags flags, ZError& error)
15:00:44    bei ZeroMQ.ZSocket.SendFrames(IEnumerable`1 frames, ZSocketFlags flags, ZError& error)
15:00:44    bei ZeroMQ.ZSocket.SendMessage(ZMessage msg, ZSocketFlags flags, ZError& error)
15:00:44    bei ZeroMQ.ZSocket.SendMessage(ZMessage msg, ZSocketFlags flags)
15:00:44    bei ZeroMQ.ZSocket.SendMessage(ZMessage msg)