Website sometimes logs error about undefined 'composermode' variable

During the smoke test, I saw the following error in the log after I viewed a create 'test' event document in the 'live environment:

09.09.2011 09:30:25 ERROR [freemarker.log.Log4JLoggerFactory$Log4JLogger.error():96] Expression composermode is undefined on line 134, column 7 in jcr:/hst:hst/hst:configurations/common/hst:templa
tes/layout.webpage.ftl.

Expression composermode is undefined on line 134, column 7 in jcr:/hst:hst/hst:configurations/common/hst:templates/layout.webpage.ftl.
The problematic instruction:
----------
==> if !composermode [on line 134, column 1 in jcr:/hst:hst/hst:configurations/common/hst:templates/layout.webpage.ftl]
----------

Java backtrace for programmers:
----------
freemarker.core.InvalidReferenceException: Expression composermode is undefined on line 134, column 7 in jcr:/hst:hst/hst:configurations/common/hst:templates/layout.webpage.ftl.
at freemarker.core.TemplateObject.assertNonNull(TemplateObject.java:124)
at freemarker.core.Expression.isTrue(Expression.java:145)
at freemarker.core.NotExpression.isTrue(NotExpression.java:66)
at freemarker.core.ConditionalBlock.accept(ConditionalBlock.java:77)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:210)
at freemarker.core.Environment.process(Environment.java:190)
at freemarker.template.Template.process(Template.java:237)
at freemarker.ext.servlet.FreemarkerServlet.process(FreemarkerServlet.java:452)
at freemarker.ext.servlet.FreemarkerServlet.doGet(FreemarkerServlet.java:391)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:551)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:488)
at org.hippoecm.hst.core.container.HstComponentInvokerImpl.invokeDispatcher(HstComponentInvokerImpl.java:381)
at org.hippoecm.hst.core.container.HstComponentInvokerImpl.invokeRender(HstComponentInvokerImpl.java:186)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:309)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:80)
at org.hippoecm.hst.core.logging.HstComponentInvokerProfiler.profile(HstComponentInvokerProfiler.java:70)
at sun.reflect.GeneratedMethodAccessor161.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:621)
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:610)
at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:65)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy4.invokeRender(Unknown Source)
at org.hippoecm.hst.core.container.AggregationValve.processWindowsRender(AggregationValve.java:359)
at org.hippoecm.hst.core.container.AggregationValve.invoke(AggregationValve.java:193)
at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:268)
at org.hippoecm.hst.core.container.ResourceServingValve.invoke(ResourceServingValve.java:80)
at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:268)
at org.hippoecm.hst.core.container.ActionValve.invoke(ActionValve.java:197)
at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:268)
at org.hippoecm.hst.core.container.SiteMenusResolvingValve.invoke(SiteMenusResolvingValve.java:35)
at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:268)
at org.hippoecm.hst.core.container.JCRSessionStatefulConcurrencyValve.invoke(JCRSessionStatefulConcurrencyValve.java:97)
at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:268)
at org.hippoecm.hst.core.container.SubjectBasedSessionValve.invoke(SubjectBasedSessionValve.java:59)
at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:268)
at org.hippoecm.hst.core.container.SecurityValve.invoke(SecurityValve.java:153)
at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:268)
at org.hippoecm.hst.core.container.LocalizationValve.invoke(LocalizationValve.java:85)
at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:268)
at org.hippoecm.hst.core.container.ContextResolvingValve.invoke(ContextResolvingValve.java:102)
at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:268)
at org.hippoecm.hst.core.container.CmsSecurityValve.invoke(CmsSecurityValve.java:82)
at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:268)
at org.hippoecm.hst.core.container.InitializationValve.invoke(InitializationValve.java:68)
at org.hippoecm.hst.core.container.HstSitePipeline$Invocation.invokeNext(HstSitePipeline.java:268)
at org.hippoecm.hst.core.container.HstSitePipeline.invokeValves(HstSitePipeline.java:235)
at org.hippoecm.hst.core.container.HstSitePipeline.invoke(HstSitePipeline.java:221)
at org.hippoecm.hst.core.container.HstRequestProcessorImpl.processRequest(HstRequestProcessorImpl.java:69)
at org.hippoecm.hst.container.HstFilter.processResolvedSiteMapItem(HstFilter.java:668)
at org.hippoecm.hst.container.HstFilter.doFilter(HstFilter.java:379)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.onehippo.gogreen.login.HstConcurrentLoginFilter.doFilter(HstConcurrentLoginFilter.java:112)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.hippoecm.hst.container.XSSUrlFilter.doFilter(XSSUrlFilter.java:49)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:470)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:291)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:396)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

I only saw this error once, so it may have to something to do with the very first rendering of a page . I could not reproduce this error locally.