D4Science Infrastructure

The workspace goes in loop and here's the stack trace

2018-03-02 14:14:32,668 ERROR server.GWTWorkspaceServiceImpl [http-bio-9090-exec-478,getFolderChildren:402] %org.gcube.common.homelibrary.home.exceptions.InternalErrorException: java.lang.NullPointerException
    at org.gcube.common.homelibrary.jcr.workspace.JCRWorkspaceSharedFolder.getUserNode(JCRWorkspaceSharedFolder.java:277)
    at org.gcube.common.homelibrary.jcr.workspace.JCRWorkspaceSharedFolder.getUserNode(JCRWorkspaceSharedFolder.java:287)
    at org.gcube.common.homelibrary.jcr.workspace.JCRWorkspaceSharedFolder.getParent(JCRWorkspaceSharedFolder.java:479)
    at org.gcube.common.homelibrary.jcr.workspace.JCRWorkspaceItem.isRoot(JCRWorkspaceItem.java:222)
    at org.gcube.portlets.user.workspace.server.GWTWorkspaceBuilder.buildGXTListFileModelItem(GWTWorkspaceBuilder.java:556)
    at org.gcube.portlets.user.workspace.server.GWTWorkspaceServiceImpl.getFolderChildren(GWTWorkspaceServiceImpl.java:375)
    at sun.reflect.GeneratedMethodAccessor2605.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:561)
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
    at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
    at sun.reflect.GeneratedMethodAccessor2088.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.liferay.portal.kernel.bean.ClassLoaderBeanHandler.invoke(ClassLoaderBeanHandler.java:67)
    at com.sun.proxy.$Proxy832.doFilter(Unknown Source)
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.processDirectCallFilter(InvokerFilterChain.java:165)
    at com.liferay.portal.kernel.