serializejson(QUERY, 'struct') - Can't cast String [struct] to a boolean

when we run serializejson(QUERY, 'struct'), Lucee throws error

Can't cast String [struct] to a boolean

ACF shows

[{"ID":"100","TITLE":"book1","DESCRIPTION":"desc1"},{"ID":"200","TITLE":"book2","DESCRIPTION":"desc2"},{"ID":"300","TITLE":"book3","DESCRIPTION":"desc3"}]

====================

lucee.runtime.exp.CasterException: Can't cast String [struct] to a boolean
at lucee.runtime.op.Caster.toBooleanValue(Caster.java:332)
at customcf.test_qry_json_cfm630$cf.call(/test-qry-json.cfm:19)
at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:938)
at lucee.runtime.PageContextImpl._doInclude(PageContextImpl.java:838)
at lucee.runtime.listener.ClassicAppListener._onRequest(ClassicAppListener.java:63)
at lucee.runtime.listener.MixedAppListener.onRequest(MixedAppListener.java:44)
at lucee.runtime.PageContextImpl.execute(PageContextImpl.java:2400)
at lucee.runtime.PageContextImpl._execute(PageContextImpl.java:2390)
at lucee.runtime.PageContextImpl.executeCFML(PageContextImpl.java:2358)
at lucee.runtime.engine.Request.exe(Request.java:46)
at lucee.runtime.engine.CFMLEngineImpl._service(CFMLEngineImpl.java:1044)
at lucee.runtime.engine.CFMLEngineImpl.serviceCFML(CFMLEngineImpl.java:992)
at lucee.loader.engine.CFMLEngineWrapper.serviceCFML(CFMLEngineWrapper.java:102)
at lucee.loader.servlet.CFMLServlet.service(CFMLServlet.java:62)
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.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
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$SocketProcessor.doRun(NioEndpoint.java:1455)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)