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java.lang.NullPointerException: null	at com.codenvy.auth.sso.client.MachineSessionInvalidator.onEvent(MachineSessionInvalidator.java:56)	at com.codenvy.auth.sso.client.MachineSessionInvalidator.onEvent(MachineSessionInvalidator.java:35)	at org.eclipse.che.api.core.notification.EventService.publish(EventService.java:105)	at org.eclipse.che.api.workspace.server.WorkspaceRuntimes.publishWorkspaceEvent(WorkspaceRuntimes.java:583)	at org.eclipse.che.api.workspace.server.WorkspaceRuntimes.stop(WorkspaceRuntimes.java:345)	at org.eclipse.che.api.workspace.server.WorkspaceManager.lambda$performAsyncStop$2(WorkspaceManager.java:663)