Exception: deserialize(): 1 Error

Hi, We are on v1.71, the code which output the above error had been running stably for a long time. However, today this error occur on the client side, with very little information to go on with, here is the call stack

Exception: deserialize(): 1
ExitGames.Client.Photon.Protocol16.Deserialize (ExitGames.Client.Photon.StreamBuffer din, Byte type)
ExitGames.Client.Photon.Protocol16.DeserializeObjectArray (ExitGames.Client.Photon.StreamBuffer din)
ExitGames.Client.Photon.Protocol16.Deserialize (ExitGames.Client.Photon.StreamBuffer din, Byte type)
ExitGames.Client.Photon.Protocol16.DeserializeHashTable (ExitGames.Client.Photon.StreamBuffer din)
ExitGames.Client.Photon.Protocol16.Deserialize (ExitGames.Client.Photon.StreamBuffer din, Byte type)
ExitGames.Client.Photon.Protocol16.DeserializeParameterTable (ExitGames.Client.Photon.StreamBuffer stream)
ExitGames.Client.Photon.Protocol16.DeserializeEventData (ExitGames.Client.Photon.StreamBuffer din)
ExitGames.Client.Photon.PeerBase.DeserializeMessageAndCallback (System.Byte[] inBuff)
ExitGames.Client.Photon.EnetPeer.DispatchIncomingCommands ()
ExitGames.Client.Photon.PhotonPeer.DispatchIncomingCommands ()
PhotonHandler.Update () (at Assets/Photon Unity Networking/Plugins/PhotonNetwork/PhotonHandler.cs:125)

We roll the code back several days and we still the error. Would anyone be kind enough to suggest a hint if they have any?

Thanks!
David