The following has evaluated to null or missing:
==> cur_tabText.btnUrl  [in template "20116#20160#10716057" at line 5, column 18]

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Tip: It's the step after the last dot that caused this error, not those before it.
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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: ${cur_tabText.btnUrl.getData()}  [in template "20116#20160#10716057" at line 5, column 16]
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1<section class="pills d-flex justify-content-md-center py-3 horizontal-scroll"> 

2  <!-- START: Pills --> 

3  <#if tabText.getSiblings()?has_content> 

4    <#list tabText.getSiblings() as cur_tabText> 

5      <a href="${cur_tabText.btnUrl.getData()}" class="btn rounded-pill mb-0 font-weight-bold shadow-none 

6      <#if cur_tabText?is_first> 

7        m-end-1 

8      <#elseif cur_tabText?is_last> 

9        m-start-1 

10      <#else> 

11        mx-1 

12      </#if> 

13      <#if getterUtil.getBoolean(cur_tabText.selected.getData())>active</#if> 

14      ">${cur_tabText.getData()}  

15      </a> 

16    </#list> 

17  </#if> 

18  <!-- END: Pills --> 

19</section>