I am using multiselect parameter plugin with Jenkins 2.426 and I am getting the  below error:

Data Used:

{{H,Sport,Team
V,SELECTED_SPORT,SELECTED_TEAM
C,Tennis,Tennisclub Rumeln-Kaldenhausen e. V.
T,,Alternative label
C,Tennis,Oppumer TC
C,Football,Rumelner TV
C,Football,FC Rumeln
C,Wakeboard,WSC Duisburg Rheinhausen}} 

2023-10-06 11:57:24.005+0000 [id=81]    WARNING o.e.j.s.h.ContextHandler$Context#log: Error while serving http://localhost:8880/$stapler/bound/8477a54d-07f1-4212-85fd-e70326e28b9b/getItemList
java.lang.NullPointerException
        at java.base/java.util.ArrayDeque.addLast(ArrayDeque.java:303)
        at java.base/java.util.ArrayDeque.add(ArrayDeque.java:494)
        at java.base/java.util.Collections.addAll(Collections.java:5624)
        at de.westemeyer.plugins.multiselect.MultiselectParameterDefinition.createCoordinates(MultiselectParameterDefinition.java:113)
        at de.westemeyer.plugins.multiselect.MultiselectParameterDefinition.getItemList(MultiselectParameterDefinition.java:89)
        at java.base/java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:732)
        at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:397)
Caused: java.lang.reflect.InvocationTargetException
        at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:401)
        at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:409)
        at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:207)
        at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:140)
        at org.kohsuke.stapler.MetaClass$JavaScriptProxyMethodDispatcher.doDispatch(MetaClass.java:661)
        at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:59)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:770)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900)
        at org.kohsuke.stapler.MetaClass$9.dispatch(MetaClass.java:475)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:770)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:836)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:900)
        at org.kohsuke.stapler.Stapler.invoke(Stapler.java:698)
        at org.kohsuke.stapler.Stapler.service(Stapler.java:209)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:590)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)
        at org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1665)
        at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:163)
        at jenkins.util.HttpServletFilter$1.doFilter(HttpServletFilter.java:76)
        at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:160)
        at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:166)
        at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
        at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
        at jenkins.ErrorAttributeFilter.doFilter(ErrorAttributeFilter.java:29)
        at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
        at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
        at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:154)
        at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
        at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
        at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:94)
        at jenkins.security.AcegiSecurityExceptionFilter.doFilter(AcegiSecurityExceptionFilter.java:52)
        at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
        at hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:54)
        at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
        at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126)
        at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120)
        at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
        at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100)
        at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
        at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:110)
        at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:101)
        at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
        at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:227)
        at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:221)
        at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
        at jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:97)
        at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
        at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:117)
        at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
        at hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:63)
        at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:99)
        at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:111)
        at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:172)
        at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
        at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
        at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:53)
        at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
        at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
        at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:86)
        at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
        at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
        at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
        at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
        at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
        at jenkins.security.SuspiciousRequestFilter.doFilter(SuspiciousRequestFilter.java:38)
        at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202)
        at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1635)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:527)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:131)
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:549)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:223)
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1570)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1384)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1543)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1306)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
        at org.eclipse.jetty.server.Server.handle(Server.java:563)
        at org.eclipse.jetty.server.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1598)
        at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:753)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:501)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:282)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)
        at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)
        at java.base/java.lang.Thread.run(Thread.java:833)