Es ist ein Fehler im MyCoRe-System aufgetreten! Ihre Anfrage konnte nicht vollständig bearbeitet werden. Der folgende Abschnitt enthält technische Daten, die das Problem verursachten. Nähere Informationen dazu kann ihnen ihr MyCoRe-Systemadministrator geben. :
Cannot invoke "org.mycore.common.content.MCRContent.getSystemId()" because "content" is null

Stack trace :

java.lang.NullPointerException: Cannot invoke "org.mycore.common.content.MCRContent.getSystemId()" because "content" is null
	at org.mycore.frontend.servlets.MCRContentServlet.lambda$render$0(MCRContentServlet.java:96)
	at org.apache.logging.log4j.util.LambdaUtil.getMessage(LambdaUtil.java:91)
	at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2008)
	at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1868)
	at org.apache.logging.log4j.spi.AbstractLogger.debug(AbstractLogger.java:342)
	at org.mycore.frontend.servlets.MCRContentServlet.render(MCRContentServlet.java:103)
	at org.mycore.frontend.servlets.MCRServlet.processRenderingPhase(MCRServlet.java:467)
	at org.mycore.frontend.servlets.MCRServlet.doGetPost(MCRServlet.java:318)
	at org.mycore.frontend.servlets.MCRServlet.doGet(MCRServlet.java:156)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:683)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:792)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:223)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.mycore.frontend.filter.MCRUserAgentFilter.doFilter(MCRUserAgentFilter.java:87)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.mycore.common.xml.MCRURIResolverFilter.doFilter(MCRURIResolverFilter.java:75)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.mycore.frontend.filter.MCRWebAppBaseFilter.doFilter(MCRWebAppBaseFilter.java:41)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.mycore.frontend.filter.MCRRequestAuthenticationFilter.doFilter(MCRRequestAuthenticationFilter.java:57)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.mycore.frontend.filter.MCRRequestDebugFilter.doFilter(MCRRequestDebugFilter.java:75)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:185)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:158)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:119)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:356)
	at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:439)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:870)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1762)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.base/java.lang.Thread.run(Thread.java:840)