Paramertized Crystal Reports freezes

Hi lawson gurus,

We are using Crystal Report with parameters, and sometimes user is not able to open that report (the reports stuck at "Please wait" before showing parameters page).
ERS log shows the CrystalEngine exceptions (the sample exception text below), and I assume that could be fixed by Guest user re-configuration (details at http://www-01.ibm.com/sup....wss?uid=swg21443725)
However, I didn't find any similar options in Lawson Reporting Services Administration.
Could you advise where I can find this option? Or just show me that I made incorrect assumptions and the errors like this can be explained by something else :)

Any help would be appreciated.

IBM WebSphere Application Server: Version: 7.0.0.21
Lawson BI version: (201105) 9-0-4-2-158 12.05.2013 20.34.09 CST

Exception text example:
ERROR | 09 Feb 2017 14:31:23,811 | WebContainer : 39 | CrystalEngine.java:443 | Error Processing Crystal Report File: The document is closing.
com.crystaldecisions.sdk.occa.report.lib.ReportSDKException: The document is closing.---- Error code:-2147215349 Error code name:docNotReady
at com.crystaldecisions.sdk.occa.report.lib.ReportSDKException.throwReportSDKException(Unknown Source)
at com.crystaldecisions.client.helper.ObjectState.a(Unknown Source)
at com.crystaldecisions.client.helper.ObjectState.if(Unknown Source)
at com.crystaldecisions.client.helper.ObjectState.stopping(Unknown Source)
at com.crystaldecisions.sdk.occa.report.application.ClientDocument.close(Unknown Source)
at com.crystaldecisions.sdk.occa.report.application.ReportClientDocument.close(Unknown Source)
at com.lawson.efs.ers.ReportEngines.CrystalEngine.processReportRequest(CrystalEngine.java:365)
at com.lawson.efs.ers.ReportEngines.ReportEngine.processReportRequest(ReportEngine.java:80)
at com.lawson.efs.ers.ReportEngines.ReportRequest.process(ReportRequest.java:460)
at com.lawson.efs.ers.web.RequestHandlerServlet.doPost(RequestHandlerServlet.java:953)
at com.lawson.efs.ers.web.RequestHandlerServlet.doGet(RequestHandlerServlet.java:85)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:718)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1657)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1597)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:104)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:77)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:908)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:934)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:502)
at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:179)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:91)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:864)
at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1592)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:276)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1604)