null Baignade au pont de Domine

Une erreur s'est produite lors du traitement du gabarit. 
The following has evaluated to null or missing:
==> cur_lien.NomDuLien  [in template "10153#10191#1151271" at line 19, column 38]

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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: #if cur_lien.NomDuLien.getData() != ""  [in template "10153#10191#1151271" at line 19, column 33]
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1<div class="actualite"> 
2    <#if SousTitre.getData() != ""> 
3        <h4>${SousTitre.getData()}</h4> 
4    </#if> 
5    <#if Documents_and_Media2889.getData() != ""> 
6        <img alt="" src="${Documents_and_Media2889.getData()}"/> 
7    </#if> 
8    <#if Contenu.getData() != ""> 
9        <p>${Contenu.getData()}</p> 
10    </#if> 
11	<#if lien.getSiblings()?has_content> 
12	    <#assign velocityCount = 1 /> 
13	    <#list lien.getSiblings() as cur_lien > 
14	        <#if cur_lien.getData() != ""> 
15	            <#if velocityCount == 1 > 
16	                <p>Document(s) à télécharger :<br> 
17                </#if> 
18			    <a href="${cur_lien.getData()}" target="_blank"> 
19			        <#if cur_lien.NomDuLien.getData() != "" > 
20			            ${cur_lien.NomDuLien.getData()} 
21		            <#else> 
22		                Document 
23		            </#if> 
24			    </a><br /> 
25			    <#if velocityCount == lien.getSiblings()?size > 
26	                </p> 
27                </#if> 
28	        </#if> 
29	        <#assign velocityCount++ /> 
30		</#list> 
31	</#if> 
32	<#if Site_web.getSiblings()?has_content> 
33		<#list Site_web.getSiblings() as cur_Site_web> 
34	        <#if cur_Site_web.getData() != ""> 
35                <a href="${cur_Site_web.getData()}" target="_blank">${cur_Site_web.getData()}</a><br /> 
36	    	</#if> 
37		</#list> 
38	</#if> 
39 
40</div>