The following has evaluated to null or missing:
==> showPublishDate  [in template "SRF_MEDIEN.TEMPLATE.BASE_NEWS" at line 81, column 40]

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Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
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FTL stack trace ("~" means nesting-related):
	- Failed at: #if showPublishDate.getData()?string ...  [in template "SRF_MEDIEN.TEMPLATE.BASE_NEWS" at line 81, column 35]
	- Reached through: #include "${templatesPath}/SRF_MEDIEN...  [in template "20115#20151#SRF_MEDIEN.TEMPLATE.INVITATION" at line 2, column 1]
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1<#assign hideShareButtons = true /> 

2<#include "${templatesPath}/SRF_MEDIEN.TEMPLATE.BASE_NEWS" />