The following has evaluated to null or missing:
==> Überschrift  [in template "20524#20562#36875" at line 2, column 11]

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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: ${Überschrift.getData()}  [in template "20524#20562#36875" at line 2, column 9]
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1<div class="kachelInhalt dienste-uebersicht"> 

2    <h3>${Überschrift.getData()}</h3> 

3    <#if Überschrift.Beschreibung.getData() != ''> 

4        <p> 

5            ${Überschrift.Beschreibung.getData()} 

6        </p> 

7    </#if> 

8    ${Inhalt.getData()} 

9</div>