Scope.log is constantly filling up. It seems to have no impact on websites, but fills up drive space. Thousands of these entries...

"ERROR","ajp-nio-8009-exec-2","07/28/2017","10:17:52","scope-context","cannot get pid for current thread
java.lang.RuntimeException: cannot get pid for current thread
at lucee.runtime.type.QueryImpl.getPid(QueryImpl.java:801)
at lucee.runtime.type.QueryImpl.get(QueryImpl.java:823)
at lucee.runtime.type.scope.storage.IKHandlerDatasource.loadData(IKHandlerDatasource.java:62)
at lucee.runtime.type.scope.storage.IKHandlerDatasource.store(IKHandlerDatasource.java:89)
at lucee.runtime.type.scope.storage.IKStorageScopeSupport.store(IKStorageScopeSupport.java:408)
at lucee.runtime.type.scope.storage.IKStorageScopeSupport.touchAfterRequest(IKStorageScopeSupport.java:288)
at lucee.runtime.PageContextImpl.release(PageContextImpl.java:552)
at lucee.runtime.CFMLFactoryImpl.releaseLuceePageContext(CFMLFactoryImpl.java:208)
at lucee.runtime.engine.CFMLEngineImpl._service(CFMLEngineImpl.java:1046)
at lucee.runtime.engine.CFMLEngineImpl.serviceCFML(CFMLEngineImpl.java:996)
at lucee.loader.engine.CFMLEngineWrapper.serviceCFML(CFMLEngineWrapper.java:102)
at lucee.loader.servlet.CFMLServlet.service(CFMLServlet.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
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.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.ajp.AjpProcessor.service(AjpProcessor.java:486)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
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:748)