StringIndexOutOfBoundsException when forwarding requests

ERROR - RequestCycle               - Error during processing error message
java.lang.StringIndexOutOfBoundsException: String index out of range: -5
        at java.lang.String.substring(String.java:1958)
        at java.lang.String.substring(String.java:1925)
        at org.apache.wicket.protocol.http.servlet.ServletWebRequest.getContextRelativeUrl(ServletWebRequest.java:180)
        at org.apache.wicket.protocol.http.servlet.ServletWebRequest.getClientUrl(ServletWebRequest.java:140)
        at org.apache.wicket.request.UrlRenderer.<init>(UrlRenderer.java:59)
        at org.apache.wicket.request.cycle.RequestCycle.newUrlRenderer(RequestCycle.java:148)
        at org.apache.wicket.request.cycle.RequestCycle.getUrlRenderer(RequestCycle.java:172)
        at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:145)
        at org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
        at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:781)
        at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
        at org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:304)
        at org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:313)
        at org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:313)
        at org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:313)
        at org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:313)
        at org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:313)
        at org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:313)
        at org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:313)
        at org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:313)
        at org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:313)
        at org.apache.wicket.request.cycle.RequestCycle.executeExceptionRequestHandler(RequestCycle.java:313)
        at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:227)
        at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
        at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:162)
        at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:218)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
        at org.jfrog.ForwardFilter.doFilter(ForwardFilter.java:22)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:394)
        at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:284)
        at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:322)
        at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1714)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at java.lang.Thread.run(Thread.java:722)

	<filter>
		<filter-name>forward</filter-name>
		<filter-class&gt;org.jfrog.ForwardFilter</filter-class&gt;
	</filter>

	<filter>
		<filter-name>wicket.wicket</filter-name>
		<filter-class&gt;org.apache.wicket.protocol.http.WicketFilter</filter-class&gt;
		<init-param>
			<param-name>applicationClassName</param-name>
			<param-value>org.jfrog.WicketApplication</param-value>
		</init-param>
	</filter>

	<filter-mapping>
		<filter-name>forward</filter-name>
		<url-pattern>/f/*</url-pattern>
	</filter-mapping>

	<filter-mapping>
		<filter-name>wicket.wicket</filter-name>
		<url-pattern>/wicket/*</url-pattern>
        <dispatcher>FORWARD</dispatcher>
        <dispatcher>REQUEST</dispatcher>
	</filter-mapping>