renderSubContent within Email nofifications

hey guys,

can maybe anyone explain me the following behavior?

I created screens for the email nofication when the customer register in our
web shop.

this works fine. But now I decided to move the ftl content to the cms module
to make our live easier when we want to change information within the
emails.

I call the content i.ex with: <@renderSubContent
subContentId="EMAIL_NOTIFICATION_HEADER" />

when I render the site withe my browser (mapping through the controller) it
works fine. But when I do a test, that a customer register, it fails. The
following error message occurs:

6548353 [default-invoker-Thread-15] ERROR
org.ofbiz.widget.screen.ModelScreen - Error rendering screen
[component://content/widget/EmailScreens.xml#main-decorator-email]:
java.lang.NullPointerException. Rolling back transaction.
6548354 [default-invoker-Thread-15] WARN
org.ofbiz.entity.transaction.TransactionUtil -
---- exception report

[TransactionUtil.setRollbackOnly] Calling transaction setRollbackOnly; this
stack trace shows where this is happening:
Exception: java.lang.Exception
Message: Error rendering screen
[component://content/widget/EmailScreens.xml#main-decorator-email]:
java.lang.NullPointerException
---- stack trace

java.lang.Exception: Error rendering screen
[component://content/widget/EmailScreens.xml#main-decorator-email]:
java.lang.NullPointerException
org.ofbiz.entity.transaction.TransactionUtil.setRollbackOnly(TransactionUtil.java:379)
org.ofbiz.entity.transaction.TransactionUtil.rollback(TransactionUtil.java:320)
org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:404)
org.ofbiz.widget.screen.ScreenFactory.renderReferencedScreen(ScreenFactory.java:216)
org.ofbiz.widget.screen.ModelScreenWidget$DecoratorScreen.renderWidgetString(ModelScreenWidget.java:580)
org.ofbiz.widget.screen.ModelScreenWidget.renderSubWidgetsString(ModelScreenWidget.java:104)
org.ofbiz.widget.screen.ModelScreenWidget$Section.renderWidgetString(ModelScreenWidget.java:191)
org.ofbiz.widget.screen.ModelScreen.renderScreenString(ModelScreen.java:396)
org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:135)
org.ofbiz.widget.screen.ScreenRenderer.render(ScreenRenderer.java:97)
org.ofbiz.common.email.EmailServices.sendMailFromScreen(EmailServices.java:462)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:606)
org.ofbiz.service.engine.StandardJavaEngine.serviceInvoker(StandardJavaEngine.java:100)
org.ofbiz.service.engine.StandardJavaEngine.runSync(StandardJavaEngine.java:57)
org.ofbiz.service.ServiceDispatcher.runSync(ServiceDispatcher.java:398)
org.ofbiz.service.ServiceDispatcher.runSync(ServiceDispatcher.java:226)
org.ofbiz.service.GenericDispatcher.runSync(GenericDispatcher.java:163)
org.ofbiz.service.job.GenericServiceJob.exec(GenericServiceJob.java:71)
org.ofbiz.service.job.JobInvoker.run(JobInvoker.java:242)
java.lang.Thread.run(Thread.java:724)