NPE in CachingResource manager

java.lang.NullPointerException
at io.undertow.core@2.2.8.Final//io.undertow.server.handlers.resource.CachingResourceManager.getResource(CachingResourceManager.java:82)
at io.undertow.core@2.2.8.Final//io.undertow.server.handlers.resource.CachingResourceManager.getResource(CachingResourceManager.java:32)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.spec.ServletContextImpl.getResourceAsStream(ServletContextImpl.java:318)
at org.wildfly.security.elytron-web.undertow-server-servlet@1.9.1.Final//org.wildfly.elytron.web.undertow.server.servlet.ElytronHttpServletExchange$1.getResource(ElytronHttpServletExchange.java:203)
at org.wildfly.security.elytron-base@1.16.0.CR1//org.wildfly.security.http.form.FormAuthenticationMechanism.sendPage(FormAuthenticationMechanism.java:365)
at org.wildfly.security.elytron-base@1.16.0.CR1//org.wildfly.security.http.form.FormAuthenticationMechanism.lambda$error$1(FormAuthenticationMechanism.java:191)
at org.wildfly.security.elytron-base@1.16.0.CR1//org.wildfly.security.http.HttpAuthenticator$AuthenticationExchange.authenticate(HttpAuthenticator.java:357)
at org.wildfly.security.elytron-base@1.16.0.CR1//org.wildfly.security.http.HttpAuthenticator$AuthenticationExchange.access$800(HttpAuthenticator.java:301)
at org.wildfly.security.elytron-base@1.16.0.CR1//org.wildfly.security.http.HttpAuthenticator.authenticate(HttpAuthenticator.java:94)
at org.wildfly.security.elytron-web.undertow-server@1.9.1.Final//org.wildfly.elytron.web.undertow.server.SecurityContextImpl.authenticate(SecurityContextImpl.java:107)
at org.wildfly.security.elytron-web.undertow-server-servlet@1.9.1.Final//org.wildfly.elytron.web.undertow.server.servlet.ServletSecurityContextImpl.authenticate(ServletSecurityContextImpl.java:115)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:55)
at io.undertow.core@2.2.8.Final//io.undertow.server.handlers.DisableCacheHandler.handleRequest(DisableCacheHandler.java:33)
at io.undertow.core@2.2.8.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.core@2.2.8.Final//io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:53)
at io.undertow.core@2.2.8.Final//io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:59)
at io.undertow.core@2.2.8.Final//io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
at org.wildfly.security.elytron-web.undertow-server-servlet@1.9.1.Final//org.wildfly.elytron.web.undertow.server.servlet.CleanUpHandler.handleRequest(CleanUpHandler.java:38)
at io.undertow.core@2.2.8.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow@24.0.0.Final-SNAPSHOT//org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.core@2.2.8.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow@24.0.0.Final-SNAPSHOT//org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.handlers.SendErrorPageHandler.handleRequest(SendErrorPageHandler.java:52)
at io.undertow.core@2.2.8.Final//io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:269)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:78)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:133)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:130)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
at org.wildfly.extension.undertow@24.0.0.Final-SNAPSHOT//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1535)
at org.wildfly.extension.undertow@24.0.0.Final-SNAPSHOT//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1535)
at org.wildfly.extension.undertow@24.0.0.Final-SNAPSHOT//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1535)
at org.wildfly.extension.undertow@24.0.0.Final-SNAPSHOT//org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1535)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:249)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:78)
at io.undertow.servlet@2.2.8.Final//io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:99)
at io.undertow.core@2.2.8.Final//io.undertow.server.Connectors.executeRootHandler(Connectors.java:387)
at io.undertow.core@2.2.8.Final//io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:841)
at org.jboss.threads@2.4.0.Final//org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1990)
at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1486)
at org.jboss.threads@2.4.0.Final//org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1377)
at org.jboss.xnio@3.8.4.Final//org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1280)
at java.base/java.lang.Thread.run(Thread.java:834)