(UPDATE: bug again in 0.9.x)Multiplayer: crash when player 1 breaks a sign as player 2 is writing on it

THIS HAS BEEN FIXED FOR 0.7.0 sorry for the lateness

Player A- Host
Player B- Visitor

When i play multiplayer as a host, on survival or creative, and when Player A break the sign block while Player B is writting on it, Player´s B game crashes and then it exit out of the App.

This happens since 0.6.0.