Akkordeon

Fehler bei der Verarbeitung der Vorlage.
The following has evaluated to null or missing:
==> cur_title.rightcol  [in template "32137#32171#418909" at line 18, column 31]

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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 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: ${cur_title.rightcol.getData()}  [in template "32137#32171#418909" at line 18, column 29]
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1<div class="panel-group accordion" id="acc-${randomNamespace}"> 
2    <#if title.getSiblings()?has_content> 
3	<#list title.getSiblings() as cur_title> 
4        <div class="panel panel-default"> 
5            <div class="panel-heading"> 
6                <h4 class="panel-title"> 
7                    <a data-toggle="collapse" data-parent="#acc-${randomNamespace}" href="#collapse-${randomNamespace}-${cur_title?index}"> 
8                    <span class="glyphicon glyphicon-plus"></span> ${cur_title.getData()}</a> 
9                </h4> 
10            </div> 
11            <div id="collapse-${randomNamespace}-${cur_title?index}" class="panel-collapse collapse"> 
12                <div class="panel-body"> 
13                    <div class="row"> 
14                        <div class="col-xs-12 col-sm-6"> 
15                            ${cur_title.content.getData()} 
16                        </div> 
17                        <div class="col-xs-12 col-sm-6"> 
18                            ${cur_title.rightcol.getData()} 
19                        </div> 
20                    </div> 
21                </div> 
22            </div> 
23        </div> 
24   	</#list> 
25    </#if>    
26</div> 
27 
28<script type="text/javascript"> 
29AUI().ready( 
30	function() {	 
31        // Add minus icon for collapse element which is open by default 
32        $(".collapse.in").each(function(){ 
33        	$(this).siblings(".panel-heading").find(".glyphicon").addClass("glyphicon-minus").removeClass("glyphicon-plus"); 
34        }); 
35         
36        // Toggle plus minus icon on show hide of collapse element 
37        $(".collapse").on('show.bs.collapse', function(){ 
38        	$(this).parent().find(".glyphicon").removeClass("glyphicon-plus").addClass("glyphicon-minus"); 
39        }).on('hide.bs.collapse', function(){ 
40        	$(this).parent().find(".glyphicon").removeClass("glyphicon-minus").addClass("glyphicon-plus"); 
41        }); 
42         
43        <#if getterUtil.getBoolean(active.getData())> 
44	        $('#acc-${randomNamespace} .panel:first-child .panel-collapse').addClass('in'); 
45		    $('#acc-${randomNamespace} .panel:first-child .panel-heading').removeClass('collapsed').find('.glyphicon-plus').toggleClass('glyphicon-plus glyphicon-minus'); 
46        </#if> 
47
48); 
49</script>