Github user corneadoug commented on the issue: https://github.com/apache/zeppelin/pull/1304 @khalidhuseynov I found out that websocket events at Notebook level are already blocked in the revision (I don't receive anything, and my actions are not affecting the original note). However there is some errors on Zeppelin server: <img width="888" alt="screen shot 2016-08-30 at 3 13 14 pm" src="https://cloud.githubusercontent.com/assets/710411/18079516/2ddd7944-6ecc-11e6-9be3-632dc0a1a704.png"> To reproduce, you can visit a revision form the dropdown. Then try running a paragraph (for example), this happen for all the Notebook websocket event (Run, Save etc...) The backend seems to be using a NotebookSocket param that isn't initiated in our case (which is good). However since the function are not checking the parameter, it generates a NPE
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