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java.lang.NullPointerException: 	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:187)	at com.google.common.cache.CustomConcurrentHashMap.getOrCompute(CustomConcurrentHashMap.java:3801)	at com.google.common.cache.ComputingCache.get(ComputingCache.java:46)	at com.atlassian.bamboo.plugins.gotobar.service.PlanHistoryService.addHistory(PlanHistoryService.java:91)	at com.atlassian.bamboo.plugins.gotobar.filters.PlanHistoryFilter.doFilter(PlanHistoryFilter.java:50)	at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:74)	at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:42)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:77)	at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:63)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1331)	at com.atlassian.bamboo.filter.AccessLogFilter.doFilter(AccessLogFilter.java:66)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1331)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:265)	at org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)	at com.atlassian.bamboo.filter.SeraphLoginFilter.doFilter(SeraphLoginFilter.java:71)	at org.acegisecurity.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:275)	at org.acegisecurity.util.FilterChainProxy.doFilter(FilterChainProxy.java:149)	at org.acegisecurity.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:98)