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Hi,i have migrated a custom theme from Liferay 7.0 to Liferay 7.2. The theme deploys without any errors.
In the theme, in portal_normal.ftl i have  a runtime portlet (JournalContentPortlet  to display an article)

 <#assign topBarSection = journalArticleLocalService.getLatestArticleByUrlTitle(themeDisplay.getScopeGroupId(), "top-bar-section", 0)>
 <#assign VOID = freeMarkerPortletPreferences.setValue("portletSetupPortletDecoratorId", "borderless") />
        <#assign theme_groupID = htmlUtil.escape(theme_display.getCompanyGroupId()?string) />
        <#assign VOID = freeMarkerPortletPreferences.setValue("groupId", '${group_id}') />
        <#assign VOID = freeMarkerPortletPreferences.setValue("articleId", '${topBarSection.getArticleId()}') />
        <@liferay_portlet["runtime"]
        defaultPreferences="${freeMarkerPortletPreferences}"
        portletProviderAction=portletProviderAction.VIEW
        instanceId="topbarcontent"
        portletName="com_liferay_journal_content_web_portlet_JournalContentPortlet" />
        ${freeMarkerPortletPreferences.reset()}

Im using freeMarkerPortletPreferences to set the runtime portlet preferences.
Unfortunatelly i get an exception at the line  <#assign VOID = freeMarkerPortletPreferences.setValue("portletSetupPortletDecoratorId", "borderless") />
The following has evaluted to null or missing:
==> freeMarkerPortletPreferences.setValue [in template "mytheme_SERVLET_CONTEXT_/templates/portal_normal.ftl" at line 120, column 24]

It did work in the Liferay 7.0 CE. Now it seems like the freeMarkerPortletPreferences variable is null, so running a setter causes an exception. In portal-ext.properties i have:
freemarker.engine.restricted.classes=
freemarket.engine.restricted.variables=

Does anybody have any idea what might be the problem?
Im using some other freemarker variables also(like ServiceLocator to get a service reference) an they work fine.