exception thrown on /harvests/ page

01-Dec-2016 19:31:28.092 WARNING [http-nio-8080-exec-1] dk.kb.webdanica.webapp.resources.HarvestsResource.harvests_list Unexpected exception thrown:java.lang.NullPointerException
 java.lang.NullPointerException
        at java.lang.StringBuilder.<init>(StringBuilder.java:109)
        at dk.kb.webdanica.core.interfaces.harvesting.SingleSeedHarvest.<init>(SingleSeedHarvest.java:153)
        at dk.kb.webdanica.core.datamodel.dao.HBasePhoenixHarvestDAO.getSingleSeed(HBasePhoenixHarvestDAO.java:53)
        at dk.kb.webdanica.core.datamodel.dao.HBasePhoenixHarvestDAO.getHarvestsFromResultSet(HBasePhoenixHarvestDAO.java:47)
        at dk.kb.webdanica.core.datamodel.dao.HBasePhoenixHarvestDAO.getAll(HBasePhoenixHarvestDAO.java:194)
        at dk.kb.webdanica.webapp.resources.HarvestsResource.harvests_list(HarvestsResource.java:106)
        at dk.kb.webdanica.webapp.resources.HarvestsResource.resource_service(HarvestsResource.java:62)
        at dk.kb.webdanica.webapp.Servlet.doGet(Servlet.java:215)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at com.antiaction.common.filter.fileupload.MultipartFormFilter.doFilter(MultipartFormFilter.java:244)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at com.antiaction.common.filter.CacheControlFilter.doFilter(CacheControlFilter.java:111)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
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