java.lang.NullPointerException
        at java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011)
        at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1006)
        at com.xpandit.jiraxporter.mapping.integration.XrayIssueMappingLoaderV1.getMappingForTestStepRuns(XrayIssueMappingLoaderV1.java:645)
        at com.xpandit.jiraxporter.mapping.integration.XrayIssueMappingLoaderV3.getMappingForTestStepRuns(XrayIssueMappingLoaderV3.java:213)
        at com.xpandit.jiraxporter.mapping.integration.XrayIssueMappingLoaderV1.getMappingForTestRuns(XrayIssueMappingLoaderV1.java:540)
        at com.xpandit.jiraxporter.mapping.integration.XrayIssueMappingLoaderV3.getMappingForTestRuns(XrayIssueMappingLoaderV3.java:136)
        at com.xpandit.jiraxporter.mapping.integration.XrayIssueMappingLoaderV2.getMappingFromTestExecution(XrayIssueMappingLoaderV2.java:221)
        at com.xpandit.jiraxporter.mapping.XporterFieldRetriever.lambda$getFieldRetriever$128(XporterFieldRetriever.java:2179)
        at com.xpandit.jiraxporter.utils.FieldMapper.lambda$getDefaultMappings$0(FieldMapper.java:254)
        at java.util.LinkedList$LLSpliterator.forEachRemaining(LinkedList.java:1235)
        at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580)
        at com.xpandit.jiraxporter.utils.FieldMapper.getDefaultMappings(FieldMapper.java:243)
        at com.xpandit.jiraxporter.mapping.XporterJIRAAPIMappingLoader.loadMapping(XporterJIRAAPIMappingLoader.java:116)
        at com.xpandit.jiraxporter.utils.DocumentBuildLookup.lookup(DocumentBuildLookup.java:158)
        at com.xpandit.jiraxporter.component.service.XporterServiceImpl.exportIssue(XporterServiceImpl.java:518)
        at com.xpandit.jiraxporter.component.service.XporterServiceImpl.generateReport(XporterServiceImpl.java:165)
        at com.xpandit.jiraxporter.servlet.IssueExportServlet.doPost(IssueExportServlet.java:361)
        at com.xpandit.jiraxporter.servlet.IssueExportServlet.doGet(IssueExportServlet.java:188)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        at com.atlassian.plugin.servlet.DelegatingPluginServlet.service(DelegatingPluginServlet.java:37)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        at com.atlassian.plugin.servlet.ServletModuleContainerServlet.service(ServletModuleContainerServlet.java:45)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
        ... 44 filtered
        at com.atlassian.servicedesk.internal.web.ExternalCustomerLockoutFilter.doFilter(ExternalCustomerLockoutFilter.java:56)
        ... 13 filtered
        at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21)
        ... 58 filtered
        at com.atlassian.jira.security.JiraSecurityFilter.lambda$doFilter$0(JiraSecurityFilter.java:66)
        ... 1 filtered
        at com.atlassian.jira.security.JiraSecurityFilter.doFilter(JiraSecurityFilter.java:64)
        ... 36 filtered
        at com.atlassian.jira.servermetrics.CorrelationIdPopulatorFilter.doFilter(CorrelationIdPopulatorFilter.java:30)
        ... 5 filtered
        at com.atlassian.servicedesk.internal.web.CustomerContextSettingFilter.lambda$invokeFilterChain$0(CustomerContextSettingFilter.java:181)
        at com.atlassian.servicedesk.internal.api.util.context.ReentrantThreadLocalBasedCodeContext.rteInvoke(ReentrantThreadLocalBasedCodeContext.java:137)
        at com.atlassian.servicedesk.internal.api.util.context.ReentrantThreadLocalBasedCodeContext.runOutOfContext(ReentrantThreadLocalBasedCodeContext.java:90)
        at com.atlassian.servicedesk.internal.utils.context.CustomerContextServiceImpl.runOutOfCustomerContext(CustomerContextServiceImpl.java:47)
        at com.atlassian.servicedesk.internal.web.CustomerContextSettingFilter.outOfCustomerContext(CustomerContextSettingFilter.java:174)
        at com.atlassian.servicedesk.internal.web.CustomerContextSettingFilter.doFilterImpl(CustomerContextSettingFilter.java:130)
        at com.atlassian.servicedesk.internal.web.CustomerContextSettingFilter.doFilter(CustomerContextSettingFilter.java:121)
        ... 4 filtered
        at com.atlassian.jwt.internal.servlet.JwtAuthFilter.doFilter(JwtAuthFilter.java:32)
        ... 8 filtered
        at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21)
        ... 4 filtered
        at com.atlassian.web.servlet.plugin.LocationCleanerFilter.doFilter(LocationCleanerFilter.java:36)
        ... 26 filtered
        at com.atlassian.jira.servermetrics.MetricsCollectorFilter.doFilter(MetricsCollectorFilter.java:25)
        ... 23 filtered
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$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)