The sitemap is working fine when i18n is disabled.

Method public java.lang.String info.magnolia.module.googlesitemap.model.SiteMapModel.getXML() threw an exception when invoked on info.magnolia.module.googlesitemap.model.SiteMapModel@6e44717d
The problematic instruction:
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==> ${model.getXML()!} [on line 2, column 1 in sitemap/pages/mainXml.ftl]
in include "/sitemap/pages/mainXml.ftl" [on line 6, column 3 in sitemap/pages/main.ftl]
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Java backtrace for programmers:
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freemarker.template.TemplateModelException: Method public java.lang.String info.magnolia.module.googlesitemap.model.SiteMapModel.getXML() threw an exception when invoked on info.magnolia.module.googlesitemap.model.SiteMapModel@6e44717d
at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:130)
at freemarker.core.MethodCall._getAsTemplateModel(MethodCall.java:93)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.DefaultToExpression._getAsTemplateModel(DefaultToExpression.java:100)
at freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
at freemarker.core.Expression.getStringValue(Expression.java:93)
at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.Environment.include(Environment.java:1508)
at freemarker.core.Include.accept(Include.java:169)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.IfBlock.accept(IfBlock.java:82)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.MixedContent.accept(MixedContent.java:92)
at freemarker.core.Environment.visit(Environment.java:221)
at freemarker.core.Environment.process(Environment.java:199)
at freemarker.template.Template.process(Template.java:237)
at info.magnolia.freemarker.FreemarkerHelper.render(FreemarkerHelper.java:153)
at info.magnolia.rendering.renderer.FreemarkerRenderer.onRender(FreemarkerRenderer.java:96)
at info.magnolia.rendering.renderer.AbstractRenderer.render(AbstractRenderer.java:151)
at info.magnolia.rendering.engine.DefaultRenderingEngine.render(DefaultRenderingEngine.java:106)
at info.magnolia.rendering.engine.DefaultRenderingEngine$$EnhancerByCGLIB$$14e2928e.render(<generated>)
at info.magnolia.rendering.engine.RenderingFilter.render(RenderingFilter.java:205)
at info.magnolia.rendering.engine.RenderingFilter.handleTemplateRequest(RenderingFilter.java:139)
at info.magnolia.rendering.engine.RenderingFilter.doFilter(RenderingFilter.java:91)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.rendering.model.ModelExecutionFilter.doFilter(ModelExecutionFilter.java:101)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at ch.esense.devicesupport.magnolia.DeviceSupportFilter.doFilter(DeviceSupportFilter.java:37)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.AggregatorFilter.doFilter(AggregatorFilter.java:103)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:57)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.RepositoryMappingFilter.doFilter(RepositoryMappingFilter.java:100)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:65)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:74)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:65)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.VirtualUriFilter.doFilter(VirtualUriFilter.java:68)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.module.cache.executor.Bypass.processCacheRequest(Bypass.java:58)
at info.magnolia.module.cache.executor.CompositeExecutor.processCacheRequest(CompositeExecutor.java:66)
at info.magnolia.module.cache.filter.CacheFilter.doFilter(CacheFilter.java:153)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.i18n.I18nContentSupportFilter.doFilter(I18nContentSupportFilter.java:73)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.RangeSupportFilter.doFilter(RangeSupportFilter.java:84)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.security.BaseSecurityFilter.doFilter(BaseSecurityFilter.java:57)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.security.SecurityCallbackFilter.doFilter(SecurityCallbackFilter.java:83)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.security.LogoutFilter.doFilter(LogoutFilter.java:94)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.module.templatingkit.filters.SiteMergeFilter.doFilter(SiteMergeFilter.java:112)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.MultiChannelFilter.doFilter(MultiChannelFilter.java:82)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.security.auth.login.LoginFilter.doFilter(LoginFilter.java:104)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:82)
at info.magnolia.cms.filters.CosMultipartRequestFilter.doFilter(CosMultipartRequestFilter.java:89)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.module.devicedetection.filter.DeviceDetectionFilter.doFilter(DeviceDetectionFilter.java:71)
at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.ContentTypeFilter.doFilter(ContentTypeFilter.java:103)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.ContextFilter.doFilter(ContextFilter.java:129)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
at info.magnolia.cms.filters.CompositeFilter.doFilter(CompositeFilter.java:65)
at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:89)
at info.magnolia.cms.filters.SafeDestroyMgnlFilterWrapper.doFilter(SafeDestroyMgnlFilterWrapper.java:106)
at info.magnolia.cms.filters.MgnlFilterDispatcher.doDispatch(MgnlFilterDispatcher.java:66)
at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:107)
at info.magnolia.cms.filters.MgnlMainFilter.doFilter(MgnlMainFilter.java:93)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.NullPointerException
at info.magnolia.module.googlesitemap.service.SiteMapService.feedSiteMapBeans(SiteMapService.java:224)
at info.magnolia.module.googlesitemap.service.SiteMapService.getSiteMapBeans(SiteMapService.java:132)
at info.magnolia.module.googlesitemap.service.SiteMapService.getSiteMapBeans(SiteMapService.java:338)
at info.magnolia.module.googlesitemap.service.SiteMapXMLUtilImpl.generateSiteMapXML(SiteMapXMLUtilImpl.java:89)
at info.magnolia.module.googlesitemap.model.SiteMapModel.getXML(SiteMapModel.java:101)
at sun.reflect.GeneratedMethodAccessor990.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:866)
at freemarker.ext.beans.SimpleMethodModel.exec(SimpleMethodModel.java:106)