Java method "com.google.common.collect.ImmutableSortedMap.get(Object)" threw an exception when invoked on com.google.common.collect.ImmutableSortedMap object "{http://rs.tdwg.org/dwc/terms/Occurrence=4544}"; see cause exception in the Java stack trace.

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FTL stack trace ("~" means nesting-related):
	- Failed at: #assign coreCount = recordsByExtensio...  [in template "WEB-INF/pages/portal/resource_new.ftl" at line 339, column 17]
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Java stack trace (for programmers):
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freemarker.core._TemplateModelException: [... Exception message was already printed; see it above ...]
	at freemarker.ext.beans._MethodUtil.newInvocationTemplateModelException(_MethodUtil.java:289)
	at freemarker.ext.beans._MethodUtil.newInvocationTemplateModelException(_MethodUtil.java:252)
	at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:74)
	at freemarker.core.MethodCall._eval(MethodCall.java:65)
	at freemarker.core.Expression.eval(Expression.java:81)
	at freemarker.core.DefaultToExpression._eval(DefaultToExpression.java:84)
	at freemarker.core.Expression.eval(Expression.java:81)
	at freemarker.core.Assignment.accept(Assignment.java:134)
	at freemarker.core.Environment.visit(Environment.java:326)
	at freemarker.core.Environment.visit(Environment.java:332)
	at freemarker.core.Environment.visit(Environment.java:332)
	at freemarker.core.Environment.visit(Environment.java:332)
	at freemarker.core.Environment.process(Environment.java:305)
	at freemarker.template.Template.process(Template.java:378)
	at org.apache.struts2.views.freemarker.FreemarkerResult.doExecute(FreemarkerResult.java:184)
	at org.apache.struts2.result.StrutsResultSupport.execute(StrutsResultSupport.java:206)
	at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:375)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:279)
	at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:179)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at org.gbif.ipt.struts2.CsrfLoginInterceptor.intercept(CsrfLoginInterceptor.java:68)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
	at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:49)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.doIntercept(ConversionErrorInterceptor.java:142)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:137)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:137)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:67)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:133)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:89)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:175)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:167)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:196)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at org.apache.struts2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:121)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at org.gbif.ipt.struts2.RedirectMessageInterceptor.doIntercept(RedirectMessageInterceptor.java:119)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:99)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at org.gbif.ipt.struts2.PrivateDeletedResourceInterceptor.intercept(PrivateDeletedResourceInterceptor.java:83)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at org.gbif.ipt.struts2.SetupAndCancelInterceptor.intercept(SetupAndCancelInterceptor.java:85)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at org.gbif.ipt.struts2.ResourceSessionInterceptor.intercept(ResourceSessionInterceptor.java:41)
	at com.google.inject.struts2.Struts2Factory$ProvidedInterceptor.intercept(Struts2Factory.java:236)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:249)
	at org.apache.struts2.factory.StrutsActionProxy.execute(StrutsActionProxy.java:48)
	at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:574)
	at org.apache.struts2.dispatcher.ExecuteOperations.executeAction(ExecuteOperations.java:79)
	at org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:141)
	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
	at org.gbif.ipt.struts2.CorsFilter.doFilter(CorsFilter.java:23)
	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
	at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120)
	at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:133)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:660)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:808)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException: Key '' not present in map
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:191)
	at com.google.common.base.Functions$FunctionForMapNoDefault.apply(Functions.java:132)
	at com.google.common.collect.ByFunctionOrdering.compare(ByFunctionOrdering.java:43)
	at com.google.common.collect.CompoundOrdering.compare(CompoundOrdering.java:41)
	at com.google.common.collect.SortedLists.binarySearch(SortedLists.java:274)
	at com.google.common.collect.RegularImmutableSortedSet.indexOf(RegularImmutableSortedSet.java:283)
	at com.google.common.collect.ImmutableSortedMap.get(ImmutableSortedMap.java:532)
	at sun.reflect.GeneratedMethodAccessor298.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:1487)
	at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:69)
	... 102 more