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Stack trace :

java.lang.NullPointerException
	at org.mycore.frontend.iview.MCRIViewServlet.getWidthOfBrowser(MCRIViewServlet.java:532)
	at org.mycore.frontend.iview.MCRIViewServlet.calculatePOIAfterZooming(MCRIViewServlet.java:321)
	at org.mycore.frontend.iview.MCRIViewServlet.setZoom(MCRIViewServlet.java:299)
	at org.mycore.frontend.iview.MCRIViewServlet.generateLayout(MCRIViewServlet.java:135)
	at org.mycore.frontend.iview.MCRIViewServlet.doGetPost(MCRIViewServlet.java:103)
	at org.mycore.frontend.servlets.MCRServlet.doGet(MCRServlet.java:144)
	at org.mycore.frontend.servlets.MCRServlet.render(MCRServlet.java:356)
	at org.mycore.frontend.servlets.MCRServlet.processRenderingPhase(MCRServlet.java:333)
	at org.mycore.frontend.servlets.MCRServlet.doGetPost(MCRServlet.java:266)
	at org.mycore.frontend.servlets.MCRServlet.doGet(MCRServlet.java:140)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.mycore.frontend.filter.MCRWebAppBaseFilter.doFilter(MCRWebAppBaseFilter.java:61)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:798)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:808)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	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)