Com.enonic.xp.portal.impl.PortalException: at index 351

Enonic version: 6.1.0
OS: Debian Linux

2015-10-20 13:51:01,499 ERROR c.e.x.p.i.e.ExceptionRendererImpl - at index 351
com.enonic.xp.portal.impl.PortalException: at index 351
        at com.enonic.xp.portal.impl.exception.ExceptionMapper.map(ExceptionMapper.java:27) ~[portal-impl-6.1.0.jar:6.1.0]
        at com.enonic.xp.portal.impl.PortalDispatcher.handleError(PortalDispatcher.java:173) [portal-impl-6.1.0.jar:6.1.0]
        at com.enonic.xp.portal.impl.PortalDispatcher.doHandle(PortalDispatcher.java:166) [portal-impl-6.1.0.jar:6.1.0]
        at com.enonic.xp.portal.impl.PortalDispatcher.doHandle(PortalDispatcher.java:68) [portal-impl-6.1.0.jar:6.1.0]
        at com.enonic.xp.web.handler.BaseWebHandler.handle(BaseWebHandler.java:40) [web-api-6.1.0.jar:6.1.0]
        at com.enonic.xp.web.impl.WebHandlerChainImpl.handle(WebHandlerChainImpl.java:35) [web-impl-6.1.0.jar:6.1.0]
        at com.enonic.xp.web.handler.OncePerRequestHandler.handle(OncePerRequestHandler.java:25) [web-api-6.1.0.jar:6.1.0]
        at com.enonic.xp.web.impl.WebHandlerChainImpl.handle(WebHandlerChainImpl.java:35) [web-impl-6.1.0.jar:6.1.0]
        at com.enonic.xp.web.handler.OncePerRequestHandler.handle(OncePerRequestHandler.java:25) [web-api-6.1.0.jar:6.1.0]
        at com.enonic.xp.web.impl.WebHandlerChainImpl.handle(WebHandlerChainImpl.java:35) [web-impl-6.1.0.jar:6.1.0]
        at com.enonic.xp.web.impl.DispatcherServlet.doService(DispatcherServlet.java:61) [web-impl-6.1.0.jar:6.1.0]
        at com.enonic.xp.web.impl.DispatcherServlet.service(DispatcherServlet.java:45) [web-impl-6.1.0.jar:6.1.0]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:668) [geronimo-servlet_3.0_spec-1.0.jar:1.0]
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:696) [pax-web-jetty-bundle-4.0.0.jar:na]
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:521) [pax-web-jetty-bundle-4.0.0.jar:na]
        at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:69) [pax-web-jetty-bundle-4.0.0.jar:na]

Hi Petter!

Do you only see this in the log, or is it noticable in any other way?

Do you know what you are doing to cause this error?

kind regards,
Jørgen