Categorienavigatie

Er trad een fout op tijdens de verwerking van de sjabloon. 
The following has evaluated to null or missing:
==> category  [in template "20097#20125#43997" at line 15, column 115]

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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: childCategories = assetCategoryServic...  [in template "20097#20125#43997" at line 15, column 57]
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1<div class="sticky"> 
2    <ul class="section-nav"> 
3        <#if entries?has_content> 
4            <#list entries as entry> 
5                <#list entry.getCategories() as x> 
6                    <#assign categoryURL = renderResponse.createRenderURL() /> 
7                    ${categoryURL.setParameter("resetCur", "true")} 
8    				${categoryURL.setParameter("categoryId", x.getCategoryId()?string)} 
9                    <li class="cats"> 
10                        <a href="${categoryURL}">${x.name}</a> 
11                        <#if serviceLocator??> 
12    						<#assign 
13    							assetCategoryService = serviceLocator.findService("com.liferay.asset.kernel.service.AssetCategoryService") 
14     
15    							childCategories = assetCategoryService.getChildCategories(category.getCategoryId()) 
16    						/> 
17     
18    						<@displayCategories categories=childCategories /> 
19    					</#if> 
20                    </li> 
21                </#list> 
22            </#list> 
23        </#if> 
24    </ul> 
25</div> 
26 
27<style> 
28    .sticky { 
29        position: fixed; 
30    } 
31    .cats { 
32        display: block; 
33        padding-left: 5em; 
34    } 
35    .cats a { 
36      display: block; 
37      padding: .125rem 1.5rem .125rem 0rem; 
38      font-family: "Nunito Sans"; 
39      font-size: 16px; 
40      font-weight: normal; 
41      font-stretch: normal; 
42      font-style: normal; 
43      line-height: 2; 
44      letter-spacing: normal; 
45      color: #666b76; 
46    } 
47    .cats a:hover { 
48    	font-weight: 600; 
49    	text-decoration: none; 
50    	color: #aa092f; 
51    	background: #feecf0; 
52    } 
53    p { 
54      font-family: "Nunito Sans"; 
55      font-size: 19px; 
56      font-weight: normal; 
57      font-stretch: normal; 
58      font-style: normal; 
59      line-height: 1.68; 
60      letter-spacing: normal; 
61      color: #474e5b; 
62    } 
63     
64    @media (max-width : 420px) { 
65	 
66    	.sticky { 
67    		padding-top: 3.5rem; 
68    		padding-bottom: 0rem; 
69    		position: static; 
70    		height: auto; 
71    		width: 100%; 
72    	} 
73    	.cats { 
74            padding-left: 0; 
75        } 
76    	.cats a { 
77    		padding: .125rem 1.5rem; 
78    	} 
79    	p { 
80    		width: 100%; 
81    		padding-left: 15px; 
82    		padding-right: 15px; 
83    	} 
84    	 
85    } 
86</style>