An error occurred while processing the template.
The following has evaluated to null or missing:
==> block.getChild('imageArticle').getAttribute('alt')  [in template "66226#66272#75354" at line 14, column 91]

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Tip: If the failing expression is known to be 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: ${block.getChild("imageArticle").getA...  [in template "66226#66272#75354" at line 14, column 89]
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1<section class="article-4-columns"> 
2    <div class="container article-wrapper"> 
3        <#if title.getData()?has_content> 
4            <h3 class="typo48">${title.getData()}</h3> 
5        </#if> 
6        <#if description.getData()?has_content> 
7            <div class="base-text typo20">${description.getData()}</div> 
8        </#if>        
9        <div class="row article-grid"> 
10            <#if separator.getSiblings() ? has_content> 
11                <#list separator.getSiblings() as block> 
12                    <article class="col-xs-12 col-sm-6 col-md-3 article-block"> 
13                        <div class="box-image"> 
14                            <img src="${block.getChild('imageArticle').getData()}" alt="${block.getChild('imageArticle').getAttribute('alt')}"/> 
15                        </div>                        
16                        <div class="box-description"> 
17                            <#if block.getChild("subTitle").getData()?has_content> 
18                                <h3 class="typo14">${block.getChild("subTitle").getData()}</h3> 
19                            </#if>  
20                            <p class="typo28"> 
21                                <a href="${block.getChild('btnArticleUrl').getData()}" target="${block.btnArticleTarget.getData()}"> 
22                                    ${block.getChild("titleArticle").getData()} 
23                                </a> 
24                            </p> 
25                            <div class="base-text typo18">${block.getChild("descriptionArticle").getData()}</div> 
26                            <a class="link blue animate-arrow-right" href="${block.getChild('btnArticleUrl').getData()}" target="${block.btnArticleTarget.getData()}"> 
27                                ${block.getChild('btnArticleText').getData()} 
28                                <svg class="icon right" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="14" height="14" viewBox="0 0 32 32"> 
29                                    <path d="M18.8 5.733c-0.8 0.8-0.8 2.067 0 2.8l5.467 5.467h-21.333c-2.6 0-2.6 4 0 4h21.333l-5.467 5.467c-1.8 1.8 1 4.667 2.8 2.8l8.867-8.867c0.8-0.733 0.8-2.067 0-2.8l-8.867-8.867c-0.733-0.8-2-0.8-2.8 0z"></path> 
30                                </svg> 
31                            </a> 
32                        </div> 
33                    </article> 
34                </#list> 
35            </#if> 
36        </div> 
37    </div> 
38</section>