فوتر یایر پیوندها

در حین انجام عملیات خطایی رخ داده است.
The following has evaluated to null or missing:
==> maintitle.mainLik  [in template "20097#20123#164377" at line 3, column 29]

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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: ${maintitle.mainLik.getData()}  [in template "20097#20123#164377" at line 3, column 27]
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1<#if maintitle.getSiblings()?has_content> 
2	<#list maintitle.getSiblings() as cur_maintitle> 
3		<a href=" ${maintitle.mainLik.getData()}"><p>${cur_maintitle.getData()}</p></a> 
4		<ul> 
5			<#list cur_maintitle.subtitle.getSiblings() as cur_subtitle> 
6				<li><a href="${cur_subtitle.link.getData()}">${cur_subtitle.getData()}</a></li> 
7			</#list> 
8		</ul> 
9	</#list> 
10</#if>