An error occurred while processing the template.
Can't convert this string to number: ""
The blamed expression:
==> currentUrl?keep_after("news-id=")?keep_before("&")?number  [in template "20097#20123#255673" at line 23, column 15]

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FTL stack trace ("~" means nesting-related):
	- Failed at: #assign id = currentUrl?keep_after("n...  [in template "20097#20123#255673" at line 23, column 1]
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1<#if entries?has_content> 
2<#list entries as curEntry> 
3<#assign currentUrl = themeDisplay.getURLCurrent() /> 
4<#assign assetRenderer=curEntry.getAssetRenderer() /> 
5<#assign className=assetRenderer.getClassName() /> 
6<#assign journalArticle=assetRenderer.getAssetObject() /> 
7<#assign article=assetRenderer.getArticle() /> 
8<#assign document=saxReaderUtil.read(journalArticle.getContentByLocale(locale)) /> 
9<#assign rootElement=document.getRootElement() /> 
10<#assign imgXPathSelector=saxReaderUtil.createXPath("dynamic-element[@name='Image' ]") /> 
11<#assign img=imgXPathSelector.selectSingleNode(rootElement).getStringValue() /> 
12<#assign titleXPathSelector=saxReaderUtil.createXPath("dynamic-element[@name='Title' ]") /> 
13<#assign title=titleXPathSelector.selectSingleNode(rootElement).getStringValue() /> 
14<#assign descriptionXPathSelector=saxReaderUtil.createXPath("dynamic-element[@name='Description' ]") /> 
15<#assign description=descriptionXPathSelector.selectSingleNode(rootElement).getStringValue() /> 
16<#attempt> 
17<#assign imgJson=jsonFactoryUtil.createJSONObject(img)> 
18<#assign imgUrl="/documents/" + imgJson.groupId +"/" +imgJson.fileEntryId +"/"+ imgJson.name +"/"+imgJson.uuid>             
19<#recover> 
20<#assign imgUrl= ''/> 
21</#attempt> 
22 
23<#assign id = currentUrl?keep_after("news-id=")?keep_before("&")?number> 
24<#if curEntry.entryId == id > 
25<div class="anb-bg-light-background-1"> 
26    <div class="container"> 
27        <div class="news-details py-5"> 
28            <div class="img-container pb-5"> 
29                <img src="${imgUrl}" /> 
30            </div> 
31            <div class="date font-weight-semi-bold mb-3">${curEntry.publishDate?string('dd MMM, yyyy')}</div> 
32            <div class="text-container d-flex"> 
33                <div class="title h1 font-weight-bold"> 
34                    <div class="sticky-top pt-4">${title}</div> 
35                </div> 
36                <div class="description">${description}</div> 
37            </div> 
38        </div> 
39    </div> 
40</div> 
41</#if> 
42</#list> 
43</#if>