indexOf undefined

[jelaev]

https://www.bootply.com/run?ext=1

Express
500 TypeError: /app/views/preview.ejs:42
   40|         <script type='text/javascript' src="<%=jq[(opts.jqueryVersion)||"1.10.1"]%>"></script>
   41| <%if (opts.jqueryui==1){%><script type='text/javascript' src="<%=inc.jqueryui.js%>"></script><%}%>
>> 42| <%if (opts.bootstrapVersion.indexOf("4.")!=-1){%><script type='text/javascript' src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script><%}%>
   43|         <script type='text/javascript' src="<%=bs[(opts.bootstrapVersion)||"4.3.1"].js%>"></script>
   44| <%if (opts.isotope==1){%><script type='text/javascript' src="<%=inc.isotope.js%>"></script><%}%>
   45| <%if (opts.masonry==1){%><script type='text/javascript' src="<%=inc.masonry.js%>"></script><%}%>

Cannot read property 'indexOf' of undefined
   40|         <script type='text/javascript' src="<%=jq[(opts.jqueryVersion)||"1.10.1"]%>"></script>
   41| <%if (opts.jqueryui==1){%><script type='text/javascript' src="<%=inc.jqueryui.js%>"></script><%}%>
>> 42| <%if (opts.bootstrapVersion.indexOf("4.")!=-1){%><script type='text/javascript' src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script><%}%>
   43|         <script type='text/javascript' src="<%=bs[(opts.bootstrapVersion)||"4.3.1"].js%>"></script>
   44| <%if (opts.isotope==1){%><script type='text/javascript' src="<%=inc.isotope.js%>"></script><%}%>
   45| <%if (opts.masonry==1){%><script type='text/javascript' src="<%=inc.masonry.js%>"></script><%}%>
Cannot read property 'indexOf' of undefined
   at eval (eval at exports.compile (/app/node_modules/ejs-locals/node_modules/ejs/lib/ejs.js:237:14), <anonymous>:30:3844)
   at eval (eval at exports.compile (/app/node_modules/ejs-locals/node_modules/ejs/lib/ejs.js:237:14), <anonymous>:30:8719)
   at /app/node_modules/ejs-locals/node_modules/ejs/lib/ejs.js:250:15
   at Object.exports.render (/app/node_modules/ejs-locals/node_modules/ejs/lib/ejs.js:288:13)
   at Object.exports.renderFile (/app/node_modules/ejs-locals/node_modules/ejs/lib/ejs.js:318:20)
   at View.module.exports [as engine] (/app/node_modules/ejs-locals/index.js:85:7)
   at View.render (/app/node_modules/express/lib/view.js:76:8)
   at Function.app.render (/app/node_modules/express/lib/application.js:518:10)
   at ServerResponse.res.render (/app/node_modules/express/lib/response.js:812:7)
   at /app/server.js:3650:9