When evaluating JavaScript without return an exception is being written to log files

java.lang.NullPointerException
	at com.xpandit.jiraxporter.utils.XporterUtils.executeJavascript(Unknown Source)
	at com.xpandit.jiraxporter.exporter.callbacks.k.replacing(Unknown Source)
	at com.aspose.words.ëL6.ë97(Unknown Source)
	at com.aspose.words.Range.ëZ(Unknown Source)
	at com.aspose.words.Range.replace(Unknown Source)
	at com.xpandit.jiraxporter.exporter.d.a(Unknown Source)
	at com.xpandit.jiraxporter.exporter.c.convert(Unknown Source)
	at com.xpandit.jiraxporter.component.service.XporterServiceImpl.exportIssue(Unknown Source)
	at com.xpandit.jiraxporter.component.service.XporterServiceImpl.generateReport(Unknown Source)
	at com.xpandit.jiraxporter.servlet.IssueExportServlet.doPost(Unknown Source)
	at com.xpandit.jiraxporter.servlet.IssueExportServlet.doGet(Unknown Source)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at com.atlassian.plugin.servlet.DelegatingPluginServlet.service(DelegatingPluginServlet.java:37)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at com.atlassian.plugin.servlet.ServletModuleContainerServlet.service(ServletModuleContainerServlet.java:45)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	... 52 filtered
	at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21)
	... 58 filtered
	at com.atlassian.jira.security.JiraSecurityFilter.lambda$doFilter$0(JiraSecurityFilter.java:76)
	... 1 filtered
	at com.atlassian.jira.security.JiraSecurityFilter.doFilter(JiraSecurityFilter.java:74)
	... 37 filtered
	at com.atlassian.jira.servermetrics.CorrelationIdPopulatorFilter.doFilter(CorrelationIdPopulatorFilter.java:30)
	... 10 filtered
	at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21)
	... 4 filtered
	at com.atlassian.web.servlet.plugin.LocationCleanerFilter.doFilter(LocationCleanerFilter.java:36)
	... 29 filtered
	at com.atlassian.jira.servermetrics.MetricsCollectorFilter.doFilter(MetricsCollectorFilter.java:25)
	... 27 filtered
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)